I have a question regarding this, I know I'm late to this but found this thread through the search, I mainly use a sniper, I don't camp, I play aggressively, push revives, utilise team shooting and am a good team player overall, I've completed multiple carries the last month or so and only watched my combat rating slowly decrease, so I'm wondering why? Is it as I haven't played much objective based game modes?

Yeah i would say so, shows you play smart and make good decisions