There is nothing wrong with this. Unfortunately the DPS increase is incredibly miniscule. So basically as a DRK you're managing these extra resources just for the "fun" of it, with very little tangible gain when compared to the overall toolkit of other tanks.
One thing I NEVER see anyone mention. Every time I waver and decide that DRK will be my new main tank, there is one annoying factor that always infuriates me: the fact that I have to have an enemy tab targeted in order to do my AOE skills. Why? I'm in the middle of a pack spamming AOE combos and DPS kills the enemy I am targeting. All of a sudden my AOE skills cease to function unless I tab target a new enemy. This is jarring as hell. As PLD, I don't need to have anything targeted to do an AOE skill. I just Spin-to-Win.
Am I the only person who has noticed this?