I got an xbox + Halo 3 for xmas it's the only reason i really wanted the xbox to be honest with you, i rate myself as an average player im up to lieutenant grade 2 now and struggling though, my BR isn't that strong, i have been playing on a sensitivity of 2 but that has just moved up to 3 as i couldn't look around enough and I am starting to get half negitive death spread and sometimes i will get 20+ kills and only 7 deaths etc. I can't really work out where I am going wrong.
Thanks in advance to anyone that helps

Regards
Griff