There's a lot of NIN gear out there that has +Enmity and goes largely ignored, primarily due to the fact that NINs don't feel like they need it to keep hate. If you want as much hate as before, just make a few gear changes.
Secondly, with most jobs you can get a pretty good idea of what they do just by their name.
"Dragoon" --- "Hmm,, bet it has something to do with dragons"
"Paladin" --- "Hmm, bet it protects other party members and is based on nobility"
"Warrior" --- "Hmm, bet it hits stuff"
"Monk" --- "Hmm, bet it fights with martial arts"
"Ninja" --- "Hmm, bet it stands directly in front of the mob in plain view and lets the mob hit the shit out of it" err...
I don't think the way NIN is currently being played is the way it was intended, NIN are supposed to be OUT of sight, I mean if a Ninja is very skilled, would you ever even see him? Ever? I personally think that they are trying to shift the focus of NIN away from being a tank, but still giving you the option if you go with all the new +Enmity gear they are releasing.