I would like to see how much boss damage or # of hits one has dealt during a multiplayer thing. Next to # of kills there should be a percentage of how much damage or how many hits each has handed out to level boss (or bosses). And if # of kills is somehow used to determine rewards, so should bossdamage then. I have anyhow noticed that on strikes the player with most kills gets best rewards. But he probably didn't shoot the boss that much and took less risk. So, concentrating on getting the boss down should be rewarded accordingly.But balanced of course, otherwise you get the opposite scenario.