Gran Turismo has sold more than Halo. Killer exclusive. And a racing game to boot. You were saying? Sony needs more entries into their exclusive series lately, but they have them. The ultra realism they try for on the PS3 is what's holding them back from a ton of games coming out in a timely manner.
UnCharted is a new killer, God of War is a continued one from last gen, Ratchet and Clank tried to comeback, but they are turning it into something else. MotorStorm was fun. Twisted Metal. Tekken was in there, but yeah.
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Killzone: +Cover system +amazing story +Fun as hell multiplayer +Semi sweet Move control implementation (Get the gun peripheral and it's awesome as hell) +Awesome Locals +Leaning -Main characters are ok not great
Halo: +Fun multiplayer (Halo 2 only) +Forge Mode +Pretty graphics -Hasn't had a good game since Halo 2 (story mode keep in mind) -Boring characters -Repetitive locals over series of games -Miniscule enemy amounts -Should have stopped at Halo 3