Call of Duty: Black Ops quite probably represents the pinnacle of the linear military shooter experience – and you wonder where the sub-genre can go from here. Treyarch's game is exhilarating and beautifully orchestrated, but it feels like a full-stop, it needs to be a full-stop, because toward the end of the campaign, bombardment fatigue begins to set in. As CoD players we have travelled the world, killing people, following orders, hunting down madmen … many of us have had enough. Call of Duty should go out on a high, or at least come back totally re-invented. Perhaps that's what we'll get with Modern Warfare 3. But for now, and for the next two-years of multiplayer engagement, revel in this game's mastery of its well-trodden domain.