To be honest Mighty Guard, White Wind, and Sticky Tongue are the only reasons it's limited from regular duty finder content. It all combines to enable some pretty broken tanking and healing in a single character, albeit one that would eventually be absolutely screwed in an actual raid environment given how much you rely on your own HP being full to utilize it for AoE. A pair of BLU with 6 DPS (ideally with a RDM/BRD among them) would be the best comp possible off of that utility alone, barring specific requirements in a fight like tank swaps and Chardybois.

The biggest problem to me is all the good DPS spells are level 50 locked, and despite what SE said about 'not needing a weapon' you actually don't get enough INT from levelling gear to warrant using any of your normal dps spells until 50. Off Guard is great but you have nothing good to use it on other than Final Sting, which along with Bristle does let you at least oneshot instance mobs solo at a normal level, but it's complete garbage compared to just getting 1000 needles asap off of a levequest and using that plus the aforementioned White Wind/Mighty Guard plus the odd CC spells to power all the way to 50 instead.

Which still pales in comparison to simply tagging mobs while your level 70 friends do all the work for you.

Why bother with the job at all if it's not going to be usable? Social play? In my experience it's been the usual mess that a new job offers, only people are raging about killing mobs that don't have an alternative option available instead of infinite DF queues.

Aesthetically and thematically there are at least some hits here. Hell, I don't even have a problem with the Learn mechanic (Getting hit by the skill you're after should just guarantee you get it if you live tbh). Otherwise, I don't see why we couldn't have gotten a normal job instead. This job needs to deal appropriate damage across all levels and while it has some tools to do that, it needs more of a push, ideally by using the job quests to give you weapon upgrades. I'm fine with 1000 needles cheese but getting to that point on your own just feels awful.