There's nothing wrong with Dark Arts.
Aren't you the one who says the tanks need to be different? Give them time to develop, and as we get more skills/ traits each tank will feel better to use.

DRK is meant to have a higher skill cap though, and if you don't like Dark Arts now then consider playing the other two tanks.

Now if only you would push for OT utility I would support this thread, because MY main gripe with DRK is the fact that its heavily frowned upon using PLD/DRK raid compositions.