As other said I play the 3 melee DPS, and I use all of them for different reasons going from personal taste to FC needs, if I feel like dancing/high sustain dps I go MNK, if I like jumping and burning I will go DGN, if I just want to dps, don't mind much about positionals, debuff and such I go NIN.
And that's what I like about the 3 melee, each has it's own way of being played.

Now, if SE turns NIN into a MNK with daggers, why the hell would I play NIN? for the looks?
Since I'll have to dance, then I'll just play MNK with the perks of not having to worry about mundras or goading WAR or other melees.