Tank was completely ignoring pulling aggro, and breaking apart groups with knocks when both DPS were AOE based.  Healer was running into completely unrelated groups and aggroing them too.  Second DPS to me was fine but obviously lower level since it scales health and stats but not the Advantages improvements, so they couldnt carry either.  The support was mostly running around like a chicken with their head cut off.  Probably some inexperienced player who didn't know how to handle the group falling apart.

Tank is a very vital role in CO, if your groups tank is fucking up, you either end up carried by a Freeform character, carried by your healer, or dying a lot as you faceroll it.