If Warrior is what a tank should be, then Pld and Drk are underpowered. Pld needs a damage increasing buff from a combo like warrior. Also, both Pld and Drk need extra effects from their combos being added as warrior has 4 effects (enmity, self healing, target damage output reduction, and slashing resistance debuff) while Pld has 2 (enmity and strength down) and drk has 3 (enmity, int down, and self heal). In the current system the Pld is the training wheels tank, the Drk is the Bike tank, and the Warrior is the Motorcycle tank. It is all about going up the ladder to a more powerful tank. It kinda dampens the play what you want element of the game.