Seriously, people need to stop talking if their posts are just littered with complete ignorance.

WAR is not a class about having your cake and eating it, too. It is a class with versatility based on trade-offs.

WAR's DPS in Defiance was already lower than DRK's DPS in Grit. After PLD's potency and ShO buffs, I'm fairly certain that PLD's ShO DPS is also higher if not on par despite them having a real advantage in mitigation.

A WAR's DPS will not be great if they are forced into Defiance. Just take a look at any top-end WAR parse and you will see that it's only possible because they are either 100% Deliverance or close to it. And, to the people discounting FC's relevance, it is the biggest contributor to a WAR's DPS by a huge margin. The fact that they lose access to it while in Defiance is a big deal. I believe for a fight like A8S FC is typically in the range of 25%~30% of a WAR's overall DPS. The next highest weapon-skill / ability is probably around 10~15%. So, on top of losing the 5% damage bonus from Deliverance, the crit bonus from stacks, and suffering a 25% damage reduction from Defiance, they lose the ability to use an ability that constitutes 25~30% of their DPS and replace it with something with 200 less potency that frequently can't be used with 100% stack efficiency.

And, without Defiance, a WAR's mitigation kit is definitely not better than either PLD or DRK.

So no, WARs don't get to have their cake and eat it, too. That's your bias and ignorance speaking. The official forums have a notoriously bad reputation of being a place where a bunch of pretty bad players talk out of their butts about stuff they have no understanding of. Please try to be better than that.