For me MW2 will be the epic fail in the COD series.
Fully automatic weapons everywhere
No pistol as 2nd weapon, but shotgun or uzi

(just to add to the weapon overkill)
death streak

need i say more
more powerfull kill streaks than the chopper of MW1 (already hated that one)
MW was the worst COD in my opinion, the skills needed are just 0. 99% of the weapons kills in a blink of an eye, and have 100rounds per mag, and a reload time of 0.1sec. Adding to this the non stop grenade spamming, makes terrible gameplay.
Just give me WW2 weapons.... bolt action snipers that require skill, semi automatic rifles and maps that end in some long-ranged fights as well.
MW people keep on laughing about the MP40 in COD5, but all weapons in MW are like the MP40 in COD5.
ANYWAYSSSSSS, what i'm saying is 'nop, im not leaving for MW2

, im gonna keep playing some BOP and more 1946, and if the patch should come, I will play a lot of BOP