Feelings on the current three tanks

[Hierro]

If you're struggling to AoE as DRK, you're messing up somewhere. As far as dps skills go, unleash is irrelevent. Its purpose was never to be a useful AoE attack, only to gather aggro for the real dps in the form of abyssal drain. The trick to sustaining AoE DPS is to use TBN on cooldown, and using your blood on quietus. If you're pulling big, you are sure to generate a lot of blood via blood price and salted earth, ontop of the blood from TBN. When this happens, you are permitted to spam DA-AD. Once you are low on MP, use quietus. If you pulled large enough, you will regenerate enough MP to spam more DA-AD, but don't go below 1/4th of your MP bar when TBN is about to come off CD.

The end result will have you performing constant AoE while maintaining tankiness. To illustrate, I was running skalla and pulled wall to wall the groups before the second boss. My healer died fairly early on in the pull because they reacted slowly to a group of AoEs, but thanks to the number of enemies, I was able to heal so much from DA-AD, and regenerate more than enough MP to continue and delay HP plummeting from TBN until my healer was rezzed back.