The problem that I have with most rework suggestions is that they're too detail orientated. Should the potency of New Awesome Skill X be 350 or 375? Should the duration be 10 seconds or should it be 10.1 seconds? I certainly don't know, and I'm sure that you don't either. I really don't want to or need to read your back-of-the-envelope calculations if you have them, either. Keep it simple.

The big picture is important. What's wrong, in broad strokes? What abilities need to be reworked, in general terms?

DRK's present problem is the lack of a central, thematic concept that unifies everything. What direction do we push in? Lifesteal? Counterattacks? Pick a direction and commit to it. And make it exclusive. If everyone else has a copycat skill, it's not really an identity.