Disclaimer: I'm only going off of things I've read on these forums, suggestion threads, random posts and whatever "game knowledge" I've accumulated since I started playing 6 years ago. I'm not a Ninja. I have no desire to be a Ninja, but I very much dislike when one job (with such a freakin cool concept) gets shafted repeatedly.
So I offer a couple solutions and would love feedback.
Innin seems to have been SE's attempt at "fixing" lolNIN damage. However, due to the nature of melee burns, being behind the mob isn't always possible, as THFs can probably point out as well.
Solution: Innin description: Puts the user in a focused state whereupon the target's weaknesses become obvious, granting the user better Accuracy, Critical Hit Rate and increased Ninjutsu Damage. This focused state leaves the user open to attack, reducing evasion and parry rate.(No longer have to be behind the target)
As any fighter can tell you, when you start to focus on attacking your opponent's weaknesses, you can often leave yourself at a defensive disadvantage, so this would work very well for NIN. Making it level 50 or, like with Call Wyvern, unusable when subbed, would take care of other jobs taking advantage of it.
As for its effect on blink-tanking...I left the ENMITY part out for a reason. Impaired Evasion and Parry already gets rid of a couple of the +points for NIN tanking, but increased damage might make up for it.
As obvious a solution as this is, I'm not sure why no-one has come up with it before (I'm sure someone has, I've just never read it).
A NIN-only series of returning throwing weapons with substantial damage.
Shurikens are awesome for damage dealing, but expensive as ****. If you've seen the movie "Kick ***", you might recall the part in the hallway at the bad-guy's building where Hit Girl has a throwing weapon on a rope, if you want to make it a realistic, actually exists in the real world kind of weapon. We already pretend that Chakrams and Boomerangs will come back after hitting something...we could always pretend some more.
We could see a realistic return to /RNG possibly with emphasis on ATK+ gear due to the Accuracy Bonuses the Ranger sub offers. MAYBE SE would be awesome enough to also create a few NIN-only Throwing WSs!
Just a couple ideas of mine.