Pure Nightblade is currently in a terrible state in both PvE and PvP. Grim Focus deals too little damage and is too easily dodged, failing to deliver the unstoppable stunning effect of Streak. Shadowy Disguise is extremely resource-intensive and only increases damage dealt to monsters, unlike Netch which provides a general damage buff and can purge.
Magicka Flood only provides 6% resources, while Sorc gains 108 Weapon Damage through Expert Mage, and Warden gains 5% Critical Damage per skill through Advanced Species. This is incredibly unfair to Nightblade!
As this post on the PTS states,
https://forums.elderscrollsonline.com/en/discussion/691932/youve-nerfed-the-worst-class-in-this-pts/p1
Nightblade is at the bottom in both PvE and PvP, the weakest class and in dire need of a rework more than any other! ZOS, please don't waste resources on classes that are already strong; you need to help the weakest class like Nightblade!