(no particular order) Favorites:
1. Seasons
2. Parenthood (completely changed gameplay for me, I actually don't prematurely age up my kids anymore)
3. Island Living, most likely (if not, then probably cats and dogs)
(I don't have most of these) Least Favorites:
1. Luxury Party Stuff
2. My First Pet, mostly because I feel like they should've just included that stuff in Cats & Dogs in the first place.
3. Spooky Stuff, I love the theme but there's just not that much in it, and you can't wear the costumes during the Halloween holiday in Seasons.