I've been playing Sims games for almost 10 years now. Sims 1... Sims 2... Sims 3... I've seen it all, and I would DEFINITELY recommend Sims 3. There have been so many fantastic new additions since the days of Sims 2 and Sims 1... And with the continuous release of expansion packs, it just gets better and better!
I'm on this game at least a few times a week, often more. Highly addictive, never-ending fun.