Call of Duty is the safest bet there is; Treyarch could have patched together another generic shooter using the same old assets, but instead, it's pursued a brand new artistic direction and some fresh ideas. They don't always work - the Strike Force missions standing out like a sore thumb alongside the rest of the superlative campaign - but they're there at least and that's enough to suggest that Treyarch is making an effort.
Black Ops 2's futurism is a revelation, freeing the gameplay from the restraints of "realism" and the story from uncomfortable politics.
It's not perfect, relying on plot clichés from The Dark Knight ("he wanted us to catch him!") and whiffing a little of Chinese Century paranoia, but David S. Goyer's script is the best Call of Duty has ever had to work with. They're a perfect match.
Treyarch understands Call of Duty better than any other studio to work on the series. Black Ops 2 is a brilliant computer game.