As I am a HUGE Treyarch fanboy, I hated Modern Warfare 2. But seriously, how has the COD series sucked time and time again? Black Ops has a great multi-player system, great Coop mode, and from what I've seen so far, a GREAT storyline and GREAT gameplay features for the campaign. Halo Reach's multi-player is in fact just trying to copy what people like most, and that is Call of Duty. Also, Nazi Zombies is much more fun than Firefight in my opinion, I'd rather kill zombies and rip they're organs apart instead of shooting brutes and elites and not getting any fun out of it.