What is good about the Psyker class?

Started a Psyker and I'm currently at level 19 and this whole class feels unrewarding and lacking. I notice I'm very fragile with not much toughness and hp. I can't really do that much damage despite being such a DPS focused class. The talents don't provide much apart from helping the staffs do more damage and cooldown but they still don't do much damage. I'm using the inferno staff which is considered very good but enemies just run through it and take 5 seconds or more to die. My build is for the inferno staff as well so I'm not sure why the damage is lacking. I've genuinely had more luck using non Psyker weapons which is horrible for a character based around using their special weapons. I mean the grenade also just doesn't do much. 45% peril just to do a little damage to big enemies is pathetic.

So either I'm doing something wrong or the Psyker requires so much setup before their kit actually becomes good which sucks because leveling is suppose to be an enjoyable process. Its really to a point I might just give up on Psyker and try a different class cause I don't really like being a class with no dps no survivability and no utility. I even have a stats menu and despite burns hordes and bosses constantly I still end up lower in the overall dps compared to teammates. So yeah I want to like this class but the process makes that hard.