best suggestion I have for you is not to ask players with a 1 point nothing KD as to how to get better at the game.. look in lobbies for players with higher KD's.. 2.5 and higher and go to theater mode and watch how they play, and compare it to how you play
i would say learn how to be an efficient and effective killer first.. once you have that down, the objective is much easier to get.. u cant get obj, if you cant kill, and you cant win games if you cant kill