I seem to score on like every 50:th shot from there, at best. I have never scored on a one-timer from the blue-line. How are they better than a regular slapper? Where do you aim? I find PP frustrating, I never seem to score.
I find that playing against a user controlled player is quite easy when on the PP.
I move the puck around quickly around the perimeter... take a couple fake slap shots and eventually the player will start chasing around with their head cut off. Soon as there's room move to the slot and take a shot. Just mix things up really.