In a "free for all" or clash type setting? Nothing. In a co-op/objective based game? Being a team player. The ability to perform multiple tasks at once, that may or may not include shooting. The ability to instantly change rolls when something goes wrong. The ability to teach/instruct people how to do something. The ability to learn quickly. Some examples, I have a friend who is insanely good at regular crucible, but can't get past 4-5 wins in ToO do to him not being a team player. I have another friend who is good at all things pvp, but is terrible in raids (can't time jumps very well, gets killed very easily)