As a 50 warrior and 23 gladiator if I run a low level dungeon and someone else wants to aggro adds and attack first that's fine by me, anything to speed things up is good. I will just DPS as much as I can, which as a by product will generate the most enmity, unless DPS are overgeared. Basically it comes down to the healer if he can heal while the DPS go crazy that's fine, if he can't and they die it will be their fault and they won't do it again or they will rage quit. O and when a DPS does rage quit I laugh, a lot, because 8-10 seconds later you'll get another 1.