Then how about you be that guy that stays back and kills mobs that continuously respawn while I solo everything? I bet you were all over these 'loot caves,' huh?
It's ok, if I can solo a Nightfall, I'm sure I'll be fine doing my Strikes for marks. That, and I never get drops, but I sure as hell get a ton of engrams at the end.
Plus, even though I run through entire rooms, I still have at least 50% more kills then either of the other fireteam members, sometimes more than both together.
I don't, however, mind the guys that hide during harder fights. I always assume they're on a bounty, or something. Doesn't bother me, but I do point and dance and bring mobs over when I'm bored. lol