Overpower feels better because it is. 120 potency and a 5x enmity modifier is 600 enmity, more than Flash's 500.
Leveling PLD to 22 for provoke was a massive pain in the ass.

PogueX,
Flash and Unleashed's cooldowns are exactly the same. They're both GCD moves, with 2.5 second cooldowns.
Healers don't generate more aggro than tanks unless you're uh.. you're bad.