Psn sadly sucks online.
Offline, it's pretty good.
But online...
Each time any dmg is dealt, it prevents mob's regen for 8 frames, but also psn dmg stops for 8 frames.
So against bosses, it's practically your merc vs the boss.
His jab will just reduce your dmg by ~90%.
And without merc/summons (to prevent gimping your own dmg) your psn nova is VERY slow at killing bosses.
It's also making it useless to use CE, and impossible to play in team.