I just realized that my three favorite games so far this year have all been on the PS3. Batman: Arkham Asylum, Uncharted 2 and Demon's Souls. Hell, you can even throw inFAMOUS and MLB: The Show in there. And Killzone? Sure it wasn't the best game ever, but it was fun.
Fine, Batman is not exclusive, but still, all the others are. I've actually spent a ton of time gaming on the PS3 this year and its been fantastic.
Of course, all that PS3 gaming ends on 11/10/09 (and really that's only because I'm going with the 360 version of MW2 for obvious reasons)