Duck and cover!
I have no idea why this game got so high scores. When I booted it up I had high expectations as this is the most hyped of all the xbox 360 games, but I was quickly bored. The graphics is good, but to me it feels wasted for such a repetitive and dull gameplay.
Basically, enter a location and get behind cover. Aim at some badguys. Kill them off. Go to next cover. Repeat until the nice graphics and different locations just is not enough to keep you want doing it.
The story and characters are uninteresting and dull too, and I got no sense of reward as I repeated the same actions over and over and over again.
Sorry, I wanted this to be fun, but it just is not. It's not a bad game, but it is absolutely not a great one...