The main issues with DRK seem to fall into 3 main categories:
1.) Tank Busters - This is really where our problem lies. They went out of their way to give paladins their own version of Inner Beast (Sheltron) and Warriors their own version of Rampart (Raw Intuition). DRK's are missing this.
A good solution? Rework the Dark Arts effect of Dark Passenger to act as our response to frequent Tank Busters. Maybe an absorption shield equal to 20% of our max health. Or a 1200 potency absorb similar to Equilibrium or Clemency.
2.) Reprisal and Delirium - I think we can all agree that a few small tweaks should be done here. If we're asking for the moon then let's ask for a way to keep reprisal up 100% of the time (even as OT) and ask for the slashing debuff to be added into Delerium.
3.) Consistent damage reduction - I actually don't think this is an issue IF the Tank Buster issue is taken care of. Dark Dance and Souleater really do take care of this problem.