Yes, it is very big with online matches. Seeing how well the original Modern Warfare did, and is still doing, online, not allowing online matches would not be bordering on insanity, it would cross the line. Duncan McPhee
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Call of Duty World at War, Modern Warfare, Modern Warfare 2, Black Ops, and Modern Warfare 3 all have online multiplayer.
Yes - multiplayer is free
There are no cheats for Call of Duty: Modern Warfare 2 online multiplayer. There are glitches, but these are slowly being patched by Infinity Ward. There are also hacks, but these are more complicated to perform. Personally, I think hacks are pointless.
no , but call of duty modern warfare reflex (cod4) has
Juggernaut is a perk in the following games Call of Duty 4 Modern Warfare, Call of Duty World at War but it was discountinued because it caused fans of the series to get upset over enemys in online multiplayer not dying