Gears of War The Ultimate Third-Person Shooter
Gears of War not only offers fantastic graphics, but easy to use and spectacular gameplay. The graphics remain good even at close range. The gameplay is easy and effective with it's wall grabbing, sprinting, blind fire, sticky aim, scope, group orders and melee attacks.
Gears of War is known for being excellent on X-Box live with a whole range of modes and Achievements.For people who do not have X-Box Live, there is an option of Co-op Campaign Mode.
The best game overall on X-Box 360.
(also if you like this you'll like Lost Planet.)