I just bought Final Fantasy 13 and I'm completely obsessed I'm new to the Final Fantasy franchise so the game play was difficult for me to get used to, since I usually play platform and third person shooters. So what about you guys?
OP: I haven't played FF13 yet due to a number of factors of me not enjoying the last FF game. I'm not really into rpgs but I do play FF. If FF13 is your first FF game, I highly recommend FFVII. It's my favourite on PS1 and I believe the PS3 can play PS1 games.
My favourite PS3 game has to be Uncharted 2 so far but I enjoy Silent Hill and Dead Space. RE5 was okay given that's more action oriented rather than survival horror but it was really only fun if you're playing with someone else. I have yet to finish Metal Gear Solid - I think I'm just avoiding it because I already saw the entire thing when someone else finished playing it so it's no surprise anymore.
I would have to say my favorite PS3 platformer is Little Big Planet. Really unique game, and a fresh break from shooters (which is what I usually play).