I feel like many people forget the reasons why changes were made to DRK as such. People praise the whole "retaliation" aspect of DRK, but forget that very point forced DRK into the MT role for optimal damage. HW DRK damage was far too RNG reliant and had too much distraction with having to keep track of procs. The way I see it, SB streamlined DRK and did a good job at doing so.

I do think DRK can use little changes here and there, like some of the ideas Chrono's mentioned before. I know I liked this one idea of increasing passive blood gain via BW to 50 from some odd number like 46. But I don't think this class is badly designed, nowhere near close to it.

as an interesting aside, I looked up some of the top parses for tanks on A12S. Warriors seem to average around 500 HPS in terms of sustain, but I found a DRK who broke 6.1k DPS while healing 700 HPS through liberal usage of TBN. The high usage makes them an outlier, but shows that you can indeed heal significantly more than WAR without impeding on your DPS.