I do all current content as DRK and have no problems. I do solid DPS both tanking and not tanking. None of my static healers have claimed it's to hard to heal me. I'm currently only i172, I just wanted to hit i170ish in tank gear and focus on getting WAR to 60 for Alex release so I can have both to swap for fights.

The only issues I have with DRK are the lack of group utility and the massive TP drain that is Blood Weapon. I'd also like Dark Arts + Dark Dance to just focus on parry and drop the evasion. Keep the average mitigation the same but only with parry since there are a lot of mechanics you cannot evade.