Alright, how do I stop the Nova Bomb or First of Havoc then? Not be there? At least Bladedancer gives you a chance.
There's a shitload more forgiveness with Blade Dancer. With both of those examples, you get one shot and you 'might' get two or three people. Blade Dancer, you miss(not likely) and you simply just melee again. Not to mention the advantage of either zigzagging all over the place making it damn near impossible to hit one or they have a medium range attack if you try to keep your distance.
In no way is it balanced.