Slow to load, obscure manner of starting single player game, drops out constantly. Driving/flying vehicles is like being on well-soaped dance-floor. Nice graphics but your buddies fall off slopes if you venture close to an edge (and no, you cannot jump them up), you have to re-load game and walk back to get them; they also get stuck in trees etc.
All-in-all a waste of 2 hours of my time – needless to say, now deleted from my system! As for being the "Halo"killer – yeah right…