Originally Posted by
Maelwys
For starters, WAR and PLD dps, when equally geared and using optimal rotations, is VERY close. The only reason WAR pulls noticeably ahead in parses is because of their resistance debuff - which when up affects PLD as well. PLD have a damage debuff in their main combo, which WAR will be able to take benefit of and which will very likely stack with WAR's new damage debuff.
Bringing a PLD and a WAR will give you two stacking 10% damage reduction debuffs on whatever you're fighting, and +10% damage (and therefore enmity generation) for both tanks. As well as the opportunity to use PLD's cooldown suite for spaced-out long periods of mitigation, and WARs cooldowns for regular short bursts of mitigation... not to mention PLD's CC abilities like Blind, Silence, a GCD stun, etc etc. and situational Cover, Provoke and Hallowed Grounds.
PLD + WAR will be better than WAR + WAR or PLD + PLD, in the same way that SCH + WHM is currently better than WHM + WHM or SCH + SCH. Which isn't to say that you won't be able to run content with any combination of them, but that it will be easier and more efficient to run with the mixed combo.