Yeah I'd agree with that. Dark Knight feels like its not as rewarding as it should be, and its mitigations are too situational for too much content. Which was basically my thoughts on how I'd change it without changing its gameplan. The original gameplan seemed to be to make GNB and DRK the high damage low utility tanks, but then with enough bitching they equalized everything and now DRK and GNB just offer less for no real upsides, something that should definitely be looked at if they want all tank damage to be equal.