I've been running around testing this. The damage done by using 'blink strike' ability(hunter subclass bladedancer) is equal to that of standard melee, both hunter subclasses. The ability 'blink strike' is described as being "A powerful melee attack with extended range." Inquiring as to whether this is meant to be the balance or if it is a mistake.
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The backstab perk is bugged and can let you OHKO from behind and in front but it may also depend on the victims FoV and weather you're in it i remember that being exploited in BF3 knife fights (a reference you may relate to :D)