After roughly 10 hours playing as the psyker and many lobbies, it’s apparent that in it’s current state the psyker is by far the weakest class. Even with the buffs, the psyker is easily outclassed by the veteran, who can kill specials faster than you can charge a single brain burst at higher levels.
There needs to be an advantage that brain burst gives you; at the moment you’d accomplish the same and more with a veteran on your team.