I feel like people avoid the guns because its harder to use starting off solo, and if you don't know what you're doing it can feel underpowered, but man is it a ton easier in a group. I'm surprised its not getting more use. Knocking retreating monsters out of the sky is better than landing a devastating GS hit.
Wish I had a WiiU now, I wanna spread my bowgun and SnS love.
(Light) bowgun user here. First it was a bit frustrating because it was weak, but now I can make a group much stronger thanks to the different playstyle.
I'm more surprised I haven't seen many dual swords wielder though, at least in EU GAF.