He is not useless. He is pretty solid on the PK. He does make some brain dead plays, to be sure, but he's quite serviceable as a 3rd pair dman.
next time he's in, watch close... he has a 'good stick' when trying to stop passes, yet, this is what you need to watch:
Corner/board puck battles, he seldom wins the puck
clearing attempts, typically soft, and dont make it out
net front positioning, almost always on the wrong side of the defender to tie up either the player or their stick
...he also gets outmuscled for positioning, even by smaller players.
so, as long as the other team is just passing the puck around the outside, he's great on the PK, but, as soon as its on his stick, or the play is in front of the net, he's quite bad.
Watch the next game, and feel free to tell me i'm wrong if you dont see exactly what i'm saying.