she feels very strong and mobile. above all i think its very problematic that she is a tank buster. tank busters are terrible for the game and should really not exist since they added role lock.
a bit of leftclick then rightclick followed by beam melts a 500 hp tank in like 3 seconds without even landing headshots. its pretty easy to land the shots on big targets and the damage is very high in relation to the ease of landing it.
i do like the idea behind the beam rewarding close range combat, and i like the fact that it is somewhat situational cause its really only useful towards targets with half health. but half health for a tank is still pretty high and its so easy to land the entire beam on a tank.
when playing tank against echo it feels like you are screwed the moment you reach ~300 hp. either you stay over 300 hp at all times or you will die in 1 second from the sticky+beam.