(continued)
My main concern, though, is on the two debuffs that War/Pld provide. Although you CAN do content with two Plds or two Wars, it's nice to get one of each for the debuff stacking.
So I hope DRK has an ability that provides which ever tank debuff is currently not on the boss. That'd be an easy way to make sure it can fit in raid teams who want both debuffs.
Other than that, I hope it can hold it's own with Pld in terms of mitigation. I'd like to see them ditch the HP for Dmg that the class has traditionally had as it's now a tank role and not a dps role.