What good games does the PS3 have? If there were any, i'd have bought them.
Metal Gear 4 was a waste in my opinion. I even played and enjoyed the last few games of the series, but the entire lack of gameplay just baffled me. I played the game for 5 hours before returning it to the rental store, and of that 5 hours I only actually "played" for about 1.
The only slightly interesting game that I see coming to PS3 is Little Big Planet, which I predict will wash over fairly quick seeing as how it is quite difficult to come across good user created content.
Xbox 360 is the place you want to be this fall. Fable 2, Gears of War 2, Fallout 3, Banjo, Call of Duty World at War, Halo Wars, Halo 4? just to name a few of the many chart toppers heading 360's way.