I can't really think of anything about The Sims...
What's so good about it? It's too repetitive for me, and NO gameplay improvements at all, from The Sims to Sims 3 and a'' the expansion packs.
If The Sims 2's save file is compatible with The Sims 3 then it's another thing... but then it's just graphical improvements, nothing else...
Well, it's just me I guess... I did like the Sims 2 for 2 months, and then I switched to Okami