Really, why can't we have some sort of medals in PVE, related to dps, hps and damage taken with resulting rewards appropriate to work done? Similar to BG.
For example good dps carried all team (nuker), so tank and healer were actually resting and second dps was doing nothing. Or quite opposite both dps were newbies or potatoes, so dungeon was completed only because tank and healer saved those newbies all the time with huge healing done and damage taken etc.
In the end those who did their work receive epic reward (100k xp, epic item, epic transmute stone), those who was resting or doing god knows what receives standard reward (33k hp, blue item, green transmute stone).