Part of that is the coach's job. The inmates ran the asylum when he was behind the bench and our players lost their sense of discipline and composure under him. And anyone that follows the team remembers the overall culture that prevailed under him over time.
It wasn't just their ability to stay disciplined and composed during games, it was some of the other bull**** in his effort to keep things "lighthearted and fun" -- one year he let players wear Halloween costumes at practice, every month they'd play "mustache boy" -- shootout loser had to wear a mustache that month. When the Pirates were in the baseball postseason, he or someone decided it would be fun to play a game of wiffle ball on the ice (and apparently Neal managed to get hurt)
It's not like I have a problem with a coach loosening things up when it's needed, but it added up with him and he didn't provide much discipline when it was needed both in their game plan and team culture. He was a breath of fresh air when the Pens needed it in 2009, but things just got worse with him over time.
Not only did the Pens underachieve under him and he held Buffalo back, he failed miserably for USA at the Olympics as well.
I imagine he would be a great coach for kids. Grown men, not so much.