My main tanking partner is a DRK, and he MTs when we work together.

Drk needs some adjustments, but its neither downright broken, or so far away from optimal that it shouldn't be incorporated into parties.

We've had Rav Ex on farm forever now, and have had Alex 1-4 on farm since day of release.

If you can't find groups that will take you as dark, find better players to play with, or look at improving your own game play.