What Are Your Favorite and Least Favorite Sims 3 Expansions Packs?

Generations, Ambitions, Late Night, University Life, and World Adventures are my favs. (Seasons is just a given necessity, so I don't even like thinking of that as an expansion pack--the game should have come with it automatically!)

I feel like Showtime and Island Life is just okay. They are interesting for a bit when you first get them, but the novelty wears off quickly and there's not much to do with them once you've completed the careers that go with them or did the resort ownership thing.