It literally offers nothing better than gunslinger, for pve or for pvp.
Titans have the same super but it is actually better in every possible aspect.
You can't even use blade dancing on bosses for dos unless you spec razors edge, which is terrible.
So what exactly is the point?
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For the entirety of year one, Bladedancer was the best PVP subclass without question. Best mobility, best evasion, best grenade, top tier super. etc. Bungie made significant nerfs to the subclass in patch 2.0 and it brought the subclass back down to earth. Now you are probably better picking Gunslinger or Nightstalker.