I was going to say this but you beat me to the punch line.

I like COD multiplayer, but i feel like there are too many variables (perks, etc) that give you an advantage / disadvantage against each and every player. In Halo, this is not the case. Everyone has the same shield and weapon at the start, which means you just have to get better (not expect some perk / weapon upgrade / etc. can save your lousy ass).

I will admit though, i stopped playing Halo all together because COD's campaign is out of control