should i buy mw2 WaW or cod4?

For multiplayer, MW2 without a doubt. If your looking for singleplayer then CoD 4 is your best option.

CoD4 - My favourite, very basic but it's the classic CoD and lots of people still play it. Everything is well balanced and the 'Old School' game mode is great fun, and isn't in any other CoD.

WaW - A great campaign but the online is, still good, but not quite as good as CoD4's in my opinion.

MW2 - Very fun online, lots of fun game modes and can be amazing with friends, although there are also lots of overpowered things, and you will be seeing the same guns / perks a lot.

COD4 actually makes sense with hit detection. WAW has zombies. MW2 is the most modern. Choose what parts you like best. Personally, I would get COD4, because I don't want to be shooting somebody's brains out with a shotgun multiple times and they dolphin dive and stab me in the toe and kill me.

Personally MW2 is my favorite CoD EVER. CoD 4 is also decent, but not as good in my opinion.

The only reason I would suggest WaW is if you are way into zombies, otherwise it's nowhere near as good.

Battlefield 3

in basic terms purchase mw3 it fairly isn't any longer hacked and it fairly is hella relaxing, yet cod4 continues to be rather relaxing, I nonetheless play it and it fairly isn't any longer been hacked for me recently, even whel there's a hacker he many times hacks to alter the sport, to no longer cheat, WAW sucks tho so don't get it

I'd personally first figure out what time period you want to play in. My favorite out of those is WaW due to the intense WWII battles and time periods. I personally think that multiplayer is THE MOST REALISTIC MULTIPLAYER OF ANY CALL OF DUTY (minus hackers). Therefore, is buy WAW

I would argue mw2 is the best option. cod4 is ok but the mw2 play style is more effective.

I would say WAW Because you have Zombies and its about the early war.

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i would say world at war if you like zombies but cod4 if you don't and if you want "zombies" that shoot back get mw3 if you don't have it, i love survival in mw3 but get blackops 2. i have it a revolution mappack and my favorite game ever. :)