Ok I now have enough financial stability to become a gunslinger.
1. Is Nameless set, Grey Owlite, Callahan, Polaris, Umbra Driver a good slinger set? I have a haildriver but since I already have an Umbra Driver I was thinking of changing it up a bit so I got a pulsar and am thinking of upgrading it to a Polaris.
2. What exactly is the role of a gunslinger? Surely it isn't to deal out raw damage, but specialized damage. To me it seems gunslingers are strictly at a support role, like a medic. To me a good gunslinger doesn't lose too much health and can revive swordies when necessary. Do I have this right?
3. Where exactly are gunslingers the most useful (levels, tiers, against which enemies, etc.)?
I too at one point was thinking of becoming a gunslinger but that day hasn't come yet that I can craft the gear for a UV.
That being said I think the Nameless set is the best one to got for and looks cool too. As for shields Grey will work but you're gonna want a few shields to interchange with whatever stratum you're on but grey does kinda cover all your bases. As for the pulsar, learn proper usage before getting it, and one thing I think every gunslinger should have is an antigua line gun. I don't care what anyone says its hands down the best underrated gun in the game, and if you're a gunslinger its like your first weapon to have. Its your sword for lack of better comparison.
As for your role, ranged support. Use pulsar to kill puppies that swordies otherwise can't get to quickly or to wrangle groups. But consider your spot behind everyone else shooting everything except mecha knights. Also you get to take the agro from trojans every time, at least you should.
Finally, a blitz needle or plague needle is a good consideration..... but don't take my word for it