I have all of the expansion packs, and none of the stuff packs.
University: Playing a sim through college can get long and dull; I’ve never had a sim get less than an 4.0 because getting the grade is so easy. College is more fun if you get them involved in as many romances as possible and then watch it all blow up when a cow mascot you’ve never seen before flirts with your sim in front of half his/her lovers at a party.
University also adds “lifetime wants” which are life goals for your sims like reaching the top of a certain career path, or having 10 kids, or have 20 lovers at once. This adds some extra challenge to the game if you desire to pursue these goals. Also, zombies.
My rating: B+
Nightlife: One of the best packs, imo, adding chemistry, dates, the pleasure aspiration, the grilled cheese aspiration (which will have “eat 200 grilled cheese sandwiches” as a lifetime want if you have Uni), cars, and the downtown area. And vampires.
A-
Open For Business: Robots, elevators, crafting benches, and of course, your own business selling anything you please to micromanage. This is probably my least used expansion pack because it sort of requires you to travel to the business lot, unless you have a home business, and I travel as little as possible because of the long, long loading screens. Eh.
C+
Pets: Adds pets (cat or dog, mainly) and werewolves. Get if you want pets, skip if you don’t want pets. Probably the most disappointing since it adds nothing but pets.
B-
Seasons: No more eternal sunshine! My personal favorite. It adds weather and all its joys–raking leaves, hypothermia, gardening, fishing, heatstroke, death by lightning, and plant sims. Now to kill someone you just have to lock them outside–something’ll get 'em.
And six new careers.
A+
Bon Voyage: I am again biased against this pack like I am against Business–for its main feature, you must travel. It adds three vacation areas where you get vacation memories, and also bigfoot. It adds little otherwise, however.
B-
FreeTime: Adds 10 hobbies, three new craft stations, and five careers. It’s okay. Not much to say about it. Get something else first.
B
Apartment Life: It adds witches and warlocks, social groups, apartments, and reputation. I’ve only had this one two weeks, so I’m still getting to know it. Having neighbors in the apartments has been a hoot so far… too early to tell whether I’ll get tired of it. I’ve only just begun playing a warlock. He’s mid-level in power, and so far none of the spells are all that interesting. Probably because he’s a good warlock. I should’ve made him evil. I have yet to discover the key to the social groups.
B+?
So I recommend them in this order: Seasons, Nightlife, Uni, Apartment life, and then it’s a bit meh from there.