Originally Posted by
Kiteless
Darkside isn't really a cooldown. You should always have it turned on unless you're bad.
DRK does have quite a few oGCD attacks, but that does not mean that they'll do more damage than WAR. Considering their major offensive buffs, DRK will generally be dealing 92% damage (Darkside at all times), WAR 90% (Maim at all times), and PLD 88% (Keen flurry a third of the time) while in their tanking stances. Then you factor in things like Unchained, Eye of the Storm and Berserk, and WAR's damage starts to soar. Furthermore, WAR has the ability to stance dance freely. Even if DRK can manage to outDPS WAR in Defiance, that doesn't really matter, since good WARs should be freely switching throughout the fight, outputting massive damage with Deliverance, and then switching to Defiance to use Inner Beast and eat any big hits.
Because of the massive MP cost and GCD attached to Grit, DRK doesn't really have this luxury. WAR has changed quite a bit with 3.0, and you're not giving it the credit it deserves.