You're level.
Mw3 you have all the weapons and perks you want.
Black ops you're relatively low level because of prestige. Weapons, pro-perks are gone as well as the infrequent playing. It's a different game dude.
No.thats not there reason. It's the hit detection and lag. We will still and always will dominate but it's beyond frustrating to play a game when you know you hit when it doesn't register.