.....read posts on the forum, explaining a scenario with a guy and another guy, shooting eachothers backs and stuff..
Honestly, think about this - If a guy (guy B) manages to notice enemy fire, turn around 180 degrees and kill the guy (guy A) shooting at him, this ofcourse affected by sensitivity, but with anything less than 50 id say this guy A svcks monkey balls and should go back to whatever hes used to. (this is a svcky player, not a bad game)
I have played several FPS games, and i like to say crysis is the hardest one when it comes to multiplayer...
Yes, this game has flaws, lots of them, but dont tell me "insert game name here" didnt have flaws at all... *cough* akimbo 1887 *cough*
I am probably one of the worst crysis2 players, i die over and over, slightly improving each round, but still very bad, however, i still enjoy it alot.
Give it some time.