Uncharted and God of War have always been Playstation titles anyway. Some things you just don't mess with, and besides the PS3 hasn't had a terribly good line up of games. Ever.
Some franchises are a staple to certain systems. Come on, the Xbox has a good line of games that are almost exclusive to the console (I'm not including the PC as a console, as I already know some titles have been made available for it as well. Hence the 'almost'), which is what makes people want it in the first place. That's part of competition. Let the PS3 have a few good titles, and the Xbox will retaliate with some of their own.
Some franchises are a staple to certain systems. Come on, the Xbox has a good line of games that are almost exclusive to the console (I'm not including the PC as a console, as I already know some titles have been made available for it as well. Hence the 'almost'), which is what makes people want it in the first place. That's part of competition. Let the PS3 have a few good titles, and the Xbox will retaliate with some of their own.