I'll hop in between the factions here, because it's where I belong.
Positionally and defensively, Hayes is playing like shit.
With the puck in the offensive zone or in, let's say, advanced transition (as in, already moving in the right direction through the neutral zone) he is the best I have ever seen him.
He's making a lot of subtle short passes that perpetuate pressure in ways that they would not have in the past. Of course he'll still sit on some pucks too long, but he's actually making better decisions faster and trusting his linemates more. And, in turn, his linemates are where they ought to be more than they had been in previous seasons. This is especially true on the power play, where he has been a highly-effective facillitator.
Hayes is not my favorite player by a long stretch. But I don't know what you're looking at if you don't see how much more effectively he is operating in the opponent's zone and at their blue line.
This whole thing is with a big asterisk, obviously, because I don't believe this team is actually 4-1-0 or anything that looks semi-decent is sustainable.