hAh ha ha ha
just camp more find a good spot to hide and shoot from their
i always remember my first MULTIPLAYER day,
although i had ended the game many times but Mulitplayer consists of new strategies, i died so many times online that i made me frustrated, then 48 hours spent in just one shot........ & i got mastered.
& now, I dont think that i am a very good palyer but i can play online & can rock (sometimes).
anywayz
you "JUDGEMENT SIGHT" should be fast enough for Judge the targets quickly
& dont always run, but go slow, try to understand the sorrouddings, & then move forwared, & dont always aim down your rifle/pistol sight, try to shoot without crosshair enabled in single palyer & on Veteran difficulty, & now you should be able to play online battle.
oh
& one more thing.
try to avoid palying soooo much of this game coz it takes A LOT of eye health.