OMG, this game is so freakin' beastly.. I dont own the game, but I've played it at my friend's house on his 360. Incredible game, better than Halo 2, imo.
I played it because my roommate rented it off gamefly. Maybe I'll play you if he still has it when we get back.
It is a great game. The use of cover in this game is fun and easy. All you have to do is hit the A button to move from object to object to find cover from the enemy. My favorite part is chainsaw bannonet (sp?) where you cut through the ememies heads.
Hopefully I'll get a 360 soon. If I do, this will be the first game that I buy and hopefully play against you guys.