The other day, I was in Qarn (min level of 35) and the tank was a DRK wearing level 10-20 caster/healer gear (minus their weapon).
It wasn't pretty... >x>
They had a sprout next to their name, so the group's healer and I suggested looking into new *tank* gear, and that DRK's damage comes from STR and Tenacity. We were met with silence... >x>
Personally, I think they need a min iLevel and they need to teach new players more about their job and role.