Playing warrior and drk side by side... The most notable imbalance is self sustain. I can't speak for paladin since I don't play it but I would say from experience with my raid buddy that his self sustain is even higher than warriors. Drk has no self healing whatsoever outside grit so you will be pestering your healer regularly unless SE is expecting us to spam TBN which doesn't make sense as a resource consumer. I don't know how anyone who plays dark cannot see the self sustain imbalances.