I've been a Bladedancer main since the early days of Destiny, in PvP at least. Over the course of 2.5 years, it has seen nerfs to the following:
Arc Blade damage
Arc Blade duration
Arc Blade swipe super usage
Arc Blade hit detection (now fixed, kind of)
Arc Bolt Grenade damage
Arc Bolt grenade radius
Skip Grenade damage
Skip Grenade tracking duration
Skip Grenade -1 tracker
Flux Grenade magnetism
Blink distance
Blink preparedness time (x2)
Blink cool down
Blink -1 recovery
Blink removes HUD
Quick Draw ready time (x2)
Blink Strike range
Blink Strike Escape Artist activation time
Blink Strike Backstab activation window
Blink Strike Fast Twitch cool down
Stalker activation time
Hungering Blade health regeneration
The only skill perks that haven't seen a nerf are Showstopper, Fleet Footed, Shadow Jack, & Encore.
Staggering, really.
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I did change up my play style and loving it but yes true BD is feeling played alot in year 2 blink recovery was kinda no reason just like knife and along with the hidden nerfs they do to all classes and guns. Swiping in air kind of confused me of why it got decreased hungry blades health regeneration got nerf hidden lunges are fairly OK encore got buff but hidden nerf the Extra duration doesn't give alot if energy back as it use to on omnigaul the thralls come out and I usually go showstopper encore but it was weird I wasn't getting much super back I felt like I was getting like .90secs back so it felt like you losing more if your super basically what I'm saying in this patch both pvp and pve you lose alot of energy to fast but it is possible to kill 3 or more guardians if your lucky to get the off guard and all close together