Is Warrior the weakest of the tanks?

[Hierro]

it isn't that great in dungeons outside of having a lot of raw damage every three pulls and you need to not be complete garbage at the game to actually take advantage of what it offers.

Even excluding IR hexadecimate, can you name a tank with better AoE capability? You can't! DRK's limited by grit in order to use BP and delirium, and the most PLD can achieve is FoF with their own eclipse spam which is still considerably weaker since it doesn't benefit from sword oath's bonus, and FoF is all they get.

WAR will always have eye+zerk for their OP spam, along with at least one decimate/steel cyclone, and of course you can always use more than one gauge AoE. But that alone is enough to make WAR that great, especially when you consider their mitigation is on par with every other tank.