My personal favorite category of games is strategy and role playing games so the best game I have played on my PS3, as a matter of fact, the best game I've played ever is metal gear solid 4. I don't like shooting games and stuff, rather I always go for games where you have to perform a task on stealth mode, a little bit of shooting and killing isn't out of question though. This is the only reason I love playing games like Assassin Creed, Splinter Cell, thief III et cetera. But metal gear solid would be on the top for sure. Actually besides MGS IV, I also love playing RIO on my PS3 especially with my little sister. Weird choice, I know right. But if you haven't tried it yet, I would say you've got to give it a try. Its a really fun sort of game. Actually its a collection of little games playable with characters from RIO (Animated Movie). If you are bored and just looking to kill some time, no serious gaming, just loads of fun, then RIO is the game you are looking for. Try it.