Playing a new Call Of Duty can feel a little like Groundhog Day. Activision banks on it. The increasingly familiar hype campaign is launched, record pre-orders follow, and this year’s update waltzes to the top of the Christmas charts. But Black Ops has an extra importance as the first Treyarch game since the Infinity Ward unpleasantness, and the narrative arc fed to the press is simple: this is going to be the B-team stepping up and knocking it for six. Like all action blockbusters, Black Ops should be a feel-good story.