I second a second job for gunslingers. I've been playing a gunslinger for nearly 3 years now and they've been lacking for pvp. Output damage is low, number of slots available is at a max of 3, lack of self buffs, lack of hp,and limited gear. They can't even use daggers as compared to their ranged counter part, the archer branch, could. Then theres the whole "trans only" gear that limits their choices of equipment.
I'll stop here since I can actually rant about this for another two or three paragraphs.
There are a few high points though. First being Desperado, one of the few skills off a ranged weapon that can penetrate pneuma. Second is full buster, one of the more power skills with no cast time, cool down is a different story.