Lots of people buy the PS3 for its Bluray player and not for gaming, its the best player out there so why not. While the 360 is a gaming console first, so its going to sell more games obviously.
My favorite games for this gen:
1. Gears of War 2. MGS4 3. Killzone 2 4. Halo 3(Underated by many) 5. Mass Effect