There are a few of these that I am just getting acquainted with from the recent sale and others that I've had a while. It's not a strict ranking.
I have not yet gotten into Horse Ranch or For Rent though I plan to so I won't rank those. Too new in my game. I love horses though so thanks.
I play with these a lot:
1. Cats and Dogs - I love the world of Brindleton Bay, play with the animals and enjoy a lot about it. I actually don't have complaints for this pack, just buy the vet's wellness treats and keep a stash of them in pet owners' inventories.
2. City Living - I'm actually going to upvote this one because I think it was released around when I started playing TS4. I've played with it a lot and my game wouldn't be the same without it. I have used the apartments a lot as starter homes or for various city residents who would not live anywhere else.
3. Growing Together - Make lifespans more interesting to play and more replayable. My game is centered around some different families with different styles and this type of playstyle works for that a lot.
4. Seasons - Everyone loves seasons.
5. Cottage Living - A British world, what's not to love?
6. Island Living - Sulani ... enough said.
7. Snowy Escape - I actually love this and I'm still exploring this pack. For me, it's very replayable, actually. I mainly use it as a vacation world but will probably explore the residential side.
8. Get Together for the world and features which I use all the time. The CAS/BB is mostly not my style at all though so I'm excluding that from the rank. I really play with Windenburg and a mash up of the Get Together and City Living townies were part of the start of my rotation back when I started playing with TS4. I do honestly have some Euro-partying sims who came from or live in Windenburg. Some of them grow up.
9. Discover University - I actually do play with this and I understand how to use it rotationally so that I can have students with excellent grades and just switch during the semester transition. I figured it out but I can see how it can be confusing for rotational play. I like to have largely nerdy high achiever sims who are stars of the class and excel. I don't ever play slacker students, so the playstyle works well for me. I usually have them take only 3 classes at a time and I make sure that they have a weekend so they have enough time to "have a life" at the university. I still actually do like this EP. I send my student sims around the campus all the time to take part in different experiences. A lot of them eat at the commons while studying but that also changes as they go through school.
10. High School Years - This actually isn't a low ranking for me because I'm still playing with it. I get the complaints about so much prom which I think can be deleted from the calendar. When you try playing a bunch of high school students like I did recently, it's a lot of fun though. I just consider the prom to be a school dance. Sometimes I send them and sometimes I skip it. It has added more teen drama for my sims. Copperdale is also an interesting world. I have played with the carnival. I have not customized the high school that much yet so mine is still pretty generic but maybe that will change. I can see why some people are looking for more delinquent shenanigans. I think there's very much the opportunity to play that type of character but it does make sense that the majority of students are going to class. It would be nice to easily send a bunch of students from my rotation at once who are not in the same household. I have a few of them that do show up but it'd be nice to select the list as the player in order to run into more of my own sims.
11. Get Famous - I actually love the actors so this isn't a low rank. Del Sol Valley could have had some more lots. I know we can make apartments there now, but still, more lots would be nice. I do play with some actors. I am mostly positive about this pack. When I want to play with fame, it is fun. I don't mind having celebrities around.
12. Eco Lifestyle - I do play with Evergreen Harbor and I play with some of the pre-mades. Some of the gameplay is not for me. I know some players love a trash world, lol. I like to make things beautiful. I do appreciate the green world. I have recently been playing a sim who is an Eco-Tech Scientist in my rotation so I am learning more about the pack. I also like the crafting skills.
13. Get To Work - I do play with the playable careers, especially the doctors. I have also played with the detectives and had some stories spring out of that. The CAS is pretty dated because this was an old EP. About the aliens, I think they learned about occults from this. Occults tend to do better in their own packs with their fanbase where they are fully developed. I delete aliens and I avoid male alien pregnancy, sorry. I do see that it is funny though.
I don't really dislike any EPs. I obviously have comments on a few areas of improvement but I honestly have fun with these.