When I was leveling an Imp alt, I kept being que'd with a sorc who:
1) Que'd as healer but refused to heal. If someone asked for heals he did not answer. Thankfully my friend que'd with me, and she could field respec into heals.
2) Was clearly spec'd in DPS tree. Did not answer when someone told him not to que as healer if he wanted to DPS.
3) Ran ahead of tank and aggro'd multiple groups. Wouldn't even offheal himself and died a lot. LOL
It was both annoying and funny at the same time seeing this guy go kamikaze and die over and over. We kept forgetting to put him on ignore, so that's why we ran into him so many times.
Well, the group finder queue times tend to be significantly shorter for tanks and healers considering how freaking rare they are compared to dps, whenever my brother plays wow, he either queues up for tank or healer and he always finds a group in like 5-10 seconds, sometimes its instant, but he thought he would try dps and he was waiting like 30-60mins for a group and then it likely failed before the tank and/or healer didn't have a clue on what they were doing.