The many reasons..

Name a game you can spend a whole 2 hours just dying, losing, barely make any progress and still have a blast?

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Give up?

We were playing it on expert mode, my brother, his two friends and myself, we barely could pass even the first stage sometimes and it was jokes the whole time. Even more frantic was four player survival against an unlimited stream of zombies. We got slightly better each time in survival, but only by a few seconds ;)

Just one more round. Just one more round.

Whereas with Modern Warfare2, it was alot of cursing, low kill/death ratios (atleast for me; ill post some pics of that later), not being able to find a good weapon/perk combo, as I no longer like the tactical knife aka Witch combination. Not to mention the 10+ min wait for a match to be setup (good job Infinity Ward.... not!) Add noob toobers.. javelin hackers.. and unlimited ammo.. prestige lvl 70s that are little kiddies.. mute mute mute mute mute... (why can't it just be auto mute everyone?) Some idiot today added our Clan tag to their name.. the impetuous btard! Seriously, you don't have enough pride to keep your own and gotta copy others?

Hence the reason why I haven't really played Mw2 in over 2 weeks.