Rather than mindlessly posting a list of every quality PS3 exclusive, I am actually going to provide a reason to play the games I recommend.
First, considering that you enjoy shooters, I recommend Resistance 2. This game offers both an exceptional single-player and multiplayer experience. The campaign has an interesting, epic story. Seeing the invasion and destruction of both San Fransisco and Chicago was amazing. Traversing a rural town in Idaho that has been overrun by the Chimera is chilling. The MP has a fun eight-player co-op mode that allows you to explore the story from a different perspective. I will not reveal any details, but it is enjoyable. The MP also has fun competitive modes. The battles are frantic, and the weaponry is both diverse and creative.
Second, I recommend Warhawk. Granted, I have not played the game recently and am therefore uncertain if there are enough players on PSN to justify this purchase. If there are enough players, this game is worth purchasing. The action is frantic, and the mixture of ground and aerial warfare is excellent. My brother and I had copious fun playing this game.
I should note that I have not played MGS 4: GotP, Valkyria Chronicles, or certain other top PS3 exclusives. Nevertheless, based on the exclusives I have played, these are the two that I recommend.
