how long have you been playing cod? like any cod? cause the longer you play, in theory, the better you become, oh, and i know its a video game, but think logically, stick to the perimeter of the map, cut inside to get a kill or two, go back out to the edge, circle the map, catch kills on the outside, constantly flank from different angles, try to predict your enemies spawn and where they will go, use your teams position to distract the enemy, use sub machine guns, or the ACR, like I said, never stay in the center of the map for more then like 2 minutes, AT THE MOST! that might seem short, but its not... always keep your head up to, I used to find myself staring at the ground a lot.. don't do that, learn the maps pretty well to, so you can flank easily, always watch your back too, its always good to play with friends also, cause you two can watch each other... yeah, thats about it