His 1 is fine as a personal defense button, but his 2 is just so... impotent. Barely even killing a Hybrid with a Stubber it feels like. I wouldn't mind seeing it buffed to make more of an impact, even if it means slapping a few extra seconds worth of cooldown on it.
His 3 also needs a hefty buff to warrant the cooldown it has. Needs more ompf (noticing a theme here?) rather than being a single Heavy Weapon's Plasma Cannon shot on half a minute cooldown...!
I mean, he is stuck with the crappy Bolter variants because his Psyker abilities are meant to compensate lacking better weaponry but they just don't.