I just got one to and here is a game for like every genre:

Roleplaying: Eternal Sonata (I think I spelt it wrong, hell I also think I got the first word wrong, I haven't played it in forever, but it is epic)

Shooter: (PS3 Exclusive): Killzone 2, Resistance 2, Uncharted 2 (Multi-platform): MW2

Misc: Little Big Planet

This isn't all the genres, but the ones I play lol. Either way, I gotta say, these are probably the best games for the PS3 atm.