Depends on which Halo they all come with their own lil changes to how they play accuracy,aiming,mobility,weapon strengths and so on. While I'm by no means a great or probably even good player I find that playing without worrying about your KD helps a lot I've hit the slicks game type this weekend and not worrying about wether my KD is going down has helped me relax while playing. After my last social game I went on to have a game of WZ and got 7 boss kills 24 Spartan kills and 6 deaths while not as good as many out there it was good for me.