Which TS2 expansion pack consistently makes the bottom of your tier list? For me, I'm still staunchly giving an F for FreeTime after all these years. No EP comes close in the number of hacks I go searching for to nuke many of its core features.

HOWEVER, the secondary aspirations are a perfect fit for the game. I appreciate some of the motive faff being reduced so I can focus more on storytelling with my Sims. And let me tell you, there is nothing that compares to the bottle of problems you can pop open by making a Family/Romance Sim.

I can't think of any EP that I really don't like. XD So I'll give a good thing about all of them.

Uni: New life stage. Further education options.
Nightlife: Mrs Crumplebottom, ok maybe not. XD Cars, dating, Pleasure aspiration.
OFB: The ability to set up a business and customise it to your liking with regards to menu, employees etc.
Pets: Animals! As a pet lover in RL, my sim world would feel wrong with no cats or dogs!
Seasons: The different types of weather and the stuff you can do in them (like snowman making when it snows).
BV: I like the themed Tropical/Asian/Forest stuff. Also, the ability to take sims away from the daily grind for a while.
Freetime: Hobbies give sims an extra dimension to their personalities. Also, the secondary aspirations. Because noone is usually wedded to one thing only. I like the added complexity.
Apartment Life: Witches. I like witches. XD

^ Same.

Uni: I used to play Uni quite a bit during my first 1-2 years of playing the game, and had so much fun with it, but I don't think I've had my sims set foot in Uni since then. I've never played sims without Uni (installed it together with the BG when it was relatively new, and always had it installed since), so it's pretty much integrated with the gameplay for me. I think there are several smaller things I probably like, such as social interactions.
Nightlife: Cars (more spesifically TS2's properly animated cars). Probably several other things as well. This too is one of the packs I'm always having some trouble distinguishing from the BG.
OFB: The craftable toys and flowers + shelves.
Pets: I'm a bit on and off with the actual pets, but play them once in a while. Happy they're there (and thankful they're much less buggy than in TS4). And with the mod that makes the baby animals have proper fur colors, it's even more fun.
Seasons: I like that it has weather/seasons and all the extra options, but it also used to cause quite bad pink-flashing issues for me, so had to turn weather off via a mod. I always wished it had more options for snow play, though. Gardening is quite neat, and having outerwear as a separate option is very useful.
BV: Rarely used the actual vacationing, but it does come with quite a lot of fun items. It does have some missed opportunities for beach/sea activities.
Freetime: All the interactable hobby-based objects. Up until mid-09 this was my last EP, so I got plenty of opportunities to test all the functions.
Apartment Life: Never was that interested in the witches or apartments, but it has a lot of extras I really love. I don't know how I managed for so long without the "freeze" coding and shifting up/down - spesifically for taking pictures, but the latter also for decorating. The ability to use the Store baby toys also makes me love this pack. Plus, I think it comes with some toddler-spesific things (spring rider and "toddler hug", if I'm not mistaken? Could be FT, too), and some playground items.
(M&G): (While not a "proper" EP, it still counts as one as far as the game is concerned) - if not for this one, finding CC and mods these days would be a nightmare... I like the outside flowers quite a bit, and some of the building options. Maybe not my favorite, but wouldn't be without it.

That's funny, circumstance had it that University was my last EP. I still need to get inducted into a secret society.

I can relate to that full integration, though. I dug every last thing I could out of OFB for a long while, even cheating in T-posing vampires when I didn't have NL. Now? I'm not sure I'll ever trust a Sim to own a business again.

Servos can stay though, they're rad.

I guess BV can actually give sims an extra want slot, and there's some business use-case for learning massages. Let's go with that.

I like new hairs and clothes, the techie computer and big television from Apartments. I extracted the objects to use in FreeTime, but could not make the clothes work. You need to be Einstein to understand clothes. I don't like anything else from Apartments. It upsets too many old things like a new installment of Microsoft Windows.

All other packs are good. They may have had only a few things each that were in need for patching. But I don't need to go to university or on vacation if I don't want to.

OFB has ... shelves. I'll go with that.

Running businesses is a chore, some of the businesses don't work, and visiting a business as a playable is pointless.
OK. I built a sex robot once, but afterwards, I decided I'd rather not go there.

I would say that Bon Voyage is my least-used EP but I guess I like jewelry. When I remember to put it on my Sims.

Bon Voyage has many faults, but one supreme accomplishment: Walk to Lot!

Oh yes, totally forgot--that is the best!

Least favorite EP is probably Pets. It felt like a downgrade from Sims 1, which had turtles, iguanas, and multiple bird options, and the cats and dogs didn't seem that expanded other than the jobs, which I never use. Also CAS for pets- too many of the premade dog breeds look wrong, and customizing pets is way too complicated. I shouldn't have to scroll through 20 layers of fur when all I want is 2 dogs with slightly different coloring patterns so they're not identical.

I like having pets in the game.

You can remove some of the layers. Some of the layers tend to barely do anything. It's also possible to add breeds, and to make your own.

I've started appreciating the multiple layers a bit more with the mod that unlocks coats and various other things on kittens/puppies. It's much more fun when you can see the coats, and with all the different layers they have a chance of inheriting different layers and colors from their parents, so you can potentially get a larger variation in the offspring. It's more fun than when they used to be single-colored.

Pets isn't one of my biggest favorites either. I'd probably be able to manage without it, since I'm not too likely to give pets to my sims these days, even if I sometimes like to give my sims small pets when I'm not bothering with cats or dogs. Still... The toddler pet hugs are the most adorable thing in this pack.

The coat colours unlock on kittens and puppies is adorable.

Absolutely BANANAS that it took until BV for this feature. Are you telling me Uni Sims had to take a taxi just to get to the student union building?

Also I doubt anyone has NL as their least favorite, but BV walk to lot and the NL lot imposters make it so much easier to enjoy neighborhoods when hopping back from TS3.

Were there no lot imposters before Nightlife?

Absolutely! My highest EP is Open for Business. My Sims have to order a taxi to go to the nest door lot. Andrew and his mum Gloria live at 19 Chorus Court in Veronaville, just across the road from Veronaville Market. If they want to go to the Market for shopping, they can't just walk across the road. No they have to order a taxi. And, when it's time to go home, they have to order another taxi to take them home again. Similarly my Sims can't walk to school or to work.

I believe that in Real Life walking was was invented several thousand years before taxis, carpools or school buses. But I suppose I could be wrong??

I seem to remember that there was a walk to lot option in the BG, and that kids could walk alone?
I think it went away with NL, although I am not 100% sure.
Least favorite EP - as far as I am concerned, such a thing does not exist

I believe they came out with NL, and if you bought any EP or SP after it would patch them in. They may have also been added in a free patch from the official site post-NL launch, but I am not sure on that.

I'd probably say Apartment Life is my least favorite EP, mostly because I didn't get it when it first came out (my last EP to get was Freetime) and I only really came across its content when the UC became available for free. But I'd probably have to say that the CAS hairs and outfits are some that I really liked out of them.
Until I discovered Default Replacements.

Hmm, I don't remember that.

People had to take taxis everywhere when I was developing Widespot in a BG-only AGS setup.

Least favorite EP: Pets.
Most favorite thing in the EP: the actual Pets.

Yeah, maxis could have done so much more with that EP. They had the chance to bring back the pet show feature of TS1 Unleashed, but instead decided to give our pets 'jobs' which honestly is a feature I never use because I don't understand how pets can have jobs. I've never seen anyone in real life say that they're pet was promoted in a job. I guess maybe they were trying to go for a Hollywood movie chihuahua approach, but it just doesn't fit right with me. I would've much rather had the pet shows, but for some dumb reason they saved that for Pet Stories. Luckily people have ported over the objects and animations from Pet Stories, just no one has implemented the actual show aspect yet. At least, not that I know of.

Anyway, to answer the OP, my least favorite EP has always been Free Time. You need so many mods to fix its nag-a-thon features. But it does redeem itself by having secondary aspirations, which I really like because they add an extra sense of depth to our Sims.

Pet jobs would make more sense if pets went to work with a sim and the job paid more with a pet attached. Like Service pets could go with the Medical career to visit hospitals or Education to be a support dog/cat for a child, Security could go with Law Enforcement and be police dogs/cats and Showbiz could go with Show Business. If the pet drops out of the career then it reverts to normal for the sim and if the sim drops out, then the pet has to as well.

Pets just hopping into the car and going off entirely on their own makes no sense.

Chris Hatch made the dog show actually work as a proper show. I can't remember where I saw the link though.

Hard to pick a least favorite. They all fall into 1 of 2 categories: "Really good features, but with glaring blemishes"; or "inoffensive but too out-of-the-way to really enjoy"

Least favorite: Pets
Favorite part: "Woofum"