I managed to find myself with some time on my hands Friday night and Saturday morning, so I decided to fire up the single player Gears of War. Man I'm really enjoying this game. It is the first 360 game I've played that actually feels like it is taking advantage of the 360's horse power. This game is gritty, and raw. The environments are rich, the graphics are amazing and the gameplay is tense and engaging. It makes Halo 2 look like "My First Shooter" by Fisher Price. No funny little aliens crying "run away" here.
The 3rd person 'cover' system works very well and is a refreshing new element to the tired FPS genre. Although GRAW brought this style to the 360 first, it just seems to work so much better with Gears. Also like GRAW this games makes heavy use of high dynamic range. Again I think it works better in Gears, but maybe that is because I can't directly compare Gear's environment to real life (thankfully).
I don't know how long the single player game is, but already I think I've clocked in more hours than GRAWs single player is long. And it's been much more rewarding play.