I haven't been able to play Melee much in PvP but I've always seen NIN overpowered compared to MNK and DRG, what is the point of view of veteran melee players toward this? What is the advantage of being DRG or MNK rather than NIN?

I mean, NIN has so many options and so many useful skills and traits.

NIN advantages:
-Vulnerability Down attack
-Powerful Ranged Attacks
-Shukuchi
-Movement Speed+
-Reduced damage taken from falling
-Assassinate
-Hide
- ???