Tank balance is staggeringly close. I play GNB/PLD which fight for the highest DPS depending on fight, and the lowest DPS WAR, almost 0 difference felt, and the top parses (which I don't come near anyway) are like 500 DPS away from one another. Not perfect, but probably as close as anybody could hope for. Absolutely excellent that an entire role has four classes that you can pick any one of and excel, not just measure up. The DPS classes and healers WISH they had this kind of balance.