Skip the campaign just go into the meat and hit Multiplayer
The enemies in the campaign will literally run into your gun and beg you to kill them. AI is non-existent. In favor of the computer simply always knowing where you are. But all that doesn't matter, go into multi-player then the game stops being a generic FPS and transforms into an exotic beauty filled with danger and wonderment. Death come quickly as human opponents are merciless and the superb graphics make a wonderful job of making the experience frantic and near photo-realistic gorgeous. Rush and Conquest by far are this games crowning achievement. There is an air of panic when running with your teammates trying to achieve an objective. You want to cheer when a skillful player mans a gunship and decimates enemy lines. It doesn't matter what i or anyone says. If you want to play the best multiplayer shooter ever made. Get this game.