Yeah, the problem with MNK is two-pronged.

They happen to be one of the top DPS in the game, as a class that isn't even selfish. They have more party utility than half of the classes below them, so the uproar against them is because they seemingly escaped any support tax that was placed on every other DPS with a party buff below them. Dragoon too, kind of. They have more utility than even freaking Bards. Why does party-wide Mantra share the same cooldown as -single target- Minne when they both do the same thing? The only plus about Bard's Minne is that it's +5% more healing. Oh, and Brotherhood happens to have half the cooldown of Battle Voice too. Sure, all ranged get raidwide mitigation, but all melee including Monk also get Feint with half the cooldown.

Actually, the way support is handled this expansion needs to be taken a long look at. It feels like at this point, some classes got gutted of their support options with nothing to make up for it, while other classes didn't lose anything and gained everything from it.