I've started Pinstar's Legacy Challenge for Sims 2. It's been tough going -- my poor sim got demoted at work and still doesn't have any friends after a week of play.
It took me about 2 minutes to get adjusted to the blockiness of the sims, but now I'm enjoying the little touches -- the rattletrap nature of the first car in the carpool, the exterminator truck, and the way they flirt with each other. I love it when one sim swoons and all the little hearts go up.
There are things I love about TS3, too -- all the worlds, and the many things the sims can do, especially if you have all the EPs -- and I'm really looking forward to TS4. Maybe if I play TS2 for two hours a day, and TS3 for 2 hours, and TS4 for two hours, I won't mind so much when my cats run away and my husband divorces me.