Bladedancers need to be faster and deal more damage with each hit. They also need to have a resistance nerf so they can easily be taken down if they run out into the open. This allows for useful kills on other players and supers if the bladedancer uses stealth and quick thinking to reach them without exposing themselves to enemy fire, which would kill them. It rewards skill more, and better reflects the assassin theme of Bladedancers

They are already easy to get taken down though. Haven't you ever killed a blade dancer?