All I hear is "I suck at PvP and Bladedancer should be nerf because I don't know what im really doing" so lets break this down for those you don't know how Arc Blade work.
Arc Blade has a moment of vulnerability where you can kill him/her during the animation. This also counts as the special being used.
If you hear the distinctive sounds the blade dancer makes, RUN AWAY! do you know how much times I get chain kills because people run towards me? Also CANCEL IT OUT WITH YOUR SPECIAL, Striker, Voidwalker, Gunslinger can kill a Bladedancer.
Also like any special is as a limit, RUN AWAY, yes they can just press a button a zig zag across slicing like a crazy man BUT each time you melee as a Bladedancer you use up some of the already ticking special bar.
Stop crying for nerfs and work on actually understanding the mechanics of the subclass.