We got the kids Guitar Hero 2 and I just lost an hour of my life playing it. I could have gone for much longer had the kids not have been cramping my playing style!
We also got them a stange little game called Viva Pinata - a sort of sims with Pinanas... but not really. It seems very cutesy - overly so. Until you learn that in order to be really successful you have to behave in very uncutesy ways. It's in interesting idea - will you be mean to creatures you love and have nurtured in order to get ahead in the game? Well - will you?