I believe It generally should be reworked...

I think the job generally is powerful defensively, but it deserves a bit more sustain generally, it feels odd how much sustain the tank lacks in comparison to other tanks, I also think generally it's "core rotation" isn't fun at all, it's generally just a copy and pasted version of warrior, which doesn't feel inspired really.

Having lots of OGCD's is fine, but I feel like gunbreaker just does that better and more often, If I wanna play a "busy tank" I feel like I'd get more enjoyment out of gunbreaker personally.

I really don't see much appeal in dark knight personally, maybe if the job felt like a cool edgy dark magic tank like I thought it would be I'd enjoy it more.