Youtube has some pretty funny trolling videos for CoD, at least there will be an update for this entertainment.
"Dude thats not quick-scoping!"
"Yeah it is, look at yer kill cam n00b!"
"Thats not a sniper, its a freakin XM blah blah with explosive rounds!"
"Its the best sniper in the game yo. Its got a scope on it!"
"U suck!"
blah blah blah - Check a few of these out. Some are funny as hell, some are just plain harassment.
I suck at multi-player in general, but I'd have to go with BF over CoD, I just can't hang like I used to. BF seems to give me more time and space to run around and enjoy the scenery before I get killed.