Grunting. Shooting. Explosions. Fist pumps. The simple formula at the core of the Gears Of War franchise is by no means original but there is no denying its world dominating success. Upon its original release in 2006, GOW was for many the reason to invest in an Xbox 360, thanks to its finely honed shoot and cover mechanics, inventive world and a single player campaign that dared to tell an engaging narrative instead of functioning as a taster for the multiplayer mode. GOW has often been held aloft as the epitome of dumb but fun gaming yet now, nearly a…