The PC version of Gears of War is everything the 360 version was and more. This game receives editor’s choice award at gamespot and various other game awards from many game sites. “The game’s story component puts you in the shoes of Marcus Fenix, who up until the very beginning of the game was serving time in prison for treasonous behavior. But the war effort requires his special brand of badness, so he’s quickly set free, dressed up in his old soldier garb, and put back into action with the members of Delta Squad. Your enemy is the menace known as the Locust, which seems to be an amalgamation of different races and creatures, all seemingly devoted to exterminating your kind and taking over your planet. The game’s plot points are inconsequential and work in a number of meaningless MacGuffin devices that serve as the only impetus you need to march from point A to point B while gunning down bad guys the whole way. You’ll blast even more bad guys in the PC version of the game, which has a new section at the start of the final act that fills in a blank left by the 360 version.”  - Jeff Gerstmann, GameSpot

Unfortunately for playable pc demo is found at the moment but screenshots and nice wallpapers can be downloaded here: http://gearsofwar.com/media/