Bladedancers and Strikers are the only subclasses with a one-hit kill melee; others either can't one-shot with it at all or need to be in their Super to.
I don't see why it matters much when 80% of the other subclasses are in the same boat
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Backstab was always so gimmicky for me. I always had the issue where I ran up behind the person but it still only did normal damage :S