I'm pretty sure he knows he's not doing his job (to the level we/he'd like).
You can't tough love someone in this situation because he already likely knows and is trying to fix it. He's in a bit of a funk but it won't last forever. I do agree though, if we're going to make any noise he has to one of the leaders in that.
He's often double/triple teamed and has to find a way to use his subtle moves (rather than will/brute force) to battle for the puck. I love that he's not afraid to show physicality but it's not his strong point. Pun intended.
I do feel that what we're seeing with Quinn needs to be the standard....quickly get the puck to the net and then have a net front presence to follow up with and be ready for rebounds. Rather than the perfect pretty play. Don't be stationary because that gets too predictable...keep moving around.