PS3 has a lot more exclusive games than the X360 but most of the PS3 exclusive games are not mega smash hit popular selling games that sell over 3 million copies ltd.
Sony has big franchises in: Uncharted, God of War, Killzone, Gran Turismo, Little Big Planet and Resistance that all sell in excess of 3 million units per game.
Microsoft has a few big franchises of its own with Gears of War, Fable, Forza and Halo that pull big numbers in excess of 3 million sales per game.
Microsoft more than makes up for its lack of exclusive games with the success and popularity of XBox Live/Kinect and X360 multi-plats/third party games are well supported and sell just as well as the PS3.