I'm a hunter main and I was one in D1, I used nightstalker more than anything and in destiny 2 I feel like it just isn't good. I think to improve it first off allow power/heavy weapons to stack with it so that it's actually viable to use against raid bosses. Another thing that could improve it is to allow it to stack with other abilities and if not maybe make its damage multiplier change depending on the number of enemies tethered by it. This is what I think nightstalker need as a PvE oriented super.
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Night stalker apart from the tether activation time is amazing. One of the best neutral games in D2 and I can do pretty well with it. Tether in PVE with Orpheus rig is insane and should not be buffed at all. Its a God tier super in PVE. If you want mean boss damage go and use Celestial Night Hawk for DPS.