Swordsman are nice and they can be key at PVP if they are cata or corsair only. You sure can deal high amounts of dmg, but it wont make your team to win.
Cmon, it is nice to be the MVP but you still lose the game cuz Doppel doesnt have much to add at PVP. You just deal dmg, as any other Archer or WL, but you dont have the utility.