Year released: 2006

The other great sci-fi franchise on Xbox, the ultraviolent Gears of War was possibly the first great advertisement for next-gen technology, showing off the abilities of Unreal Engine 3 with the gnarled musculature of its grotesque characters (both human and alien) and highly detailed war-torn environments.

It was also the game which brought the concept of using cover during firefights into the mainstream, a mechanic now taken for granted, as well as the greatest use of chainsaws in a game since the heyday of Doom.