A change is as good as a rest, so they say. In Infinity Ward's case, a change must have been absolutely essential for its own collective sanity, having worked solidly on World War II shooters for longer than can be strictly healthy.
For now, all you really need to know is this a huge return to form for the Call of Duty series, and for war-based FPS titles in general. Even without the vastly impressive multiplayer elements, Modern Warfare would be worth buying for its outstanding single-player campaign. It succeeds not only for being consistently spectacular, but for the way it has been crafted into something that keeps you engaged right to the very end.
Eurogamer have updated there review for this and now added ps3, same review same score