Personally I think I'm not going to play TS4 because it's not for my gameplay style. It's focused on social interactions, but I hate doing social thinks with my sims (exception of weddings, birthdays etc) the only social think I do every sim day is chatting from net, to raise the social bar. And also I think TS4 is too similar to TS2, which is the worst game in the series for me.
I agree that TS3 is too buggy but it's not the game's fault, it's the developer's fault. They don't want to improve the game with updates because they want TS4 to sell more, which is not fair.