Since the benefits they impemented for Tanks, everyone hops on the fast queue lane...

bad players being bad players since beta 0.01, but with a tank failing, it just weights more...

We kicked a DD last week in a roulett grp who was clearly trolling... pulling all first, ignoring numbered marks, insulting me for not healing him, cause i refused like he refused the advice ("see i****, i am taking damage" "childish ret**** not healing me".. blah blah...
and cause DD´s are like sand on the beach, we voted him out and had fun for the rest of the dungeon ^^

sure, you could abandon, eat the 30 minutes and do other things in between, vote for abort (likely, your other teammates don´t like this as well),... or ignore him entirely, finish the instance as good as it gets, and make something of it.

Always remember, it´s just a game, take the most of fun out of it... one of it, making funny stories about not-good-players in forums ^^