I picked up Modern Warfare 3 .lol Already had it on consoles before but I figured, why not.
I'm a big fan of it for FFA. Honestly COD 4 and MW3 are neck to neck on that one.
There are a few hackers on there though but luckily have only ran into them once.
Black Ops 2 isn't bad at all, multiplayer wise. The community is there and no hackers is a plus. Runs very good on PC too.
I'm not a fan of zombies so can't say anything about it. Always been lame to me for some reason.