No dog in this fight, but I see a lot of posts talking up Roy's coaching.
He was really bad with the Avalanche. I know he won the Jack Adams during that magical 2013-2014 season. I have great memories of that year, but it was clearly a fluke season. All of Roy's Colorado teams defended poorly and relied on scoring off the transition. The Avalanche were constantly pinned in their own zone, but would somehow win games they were outshot 35-25 thanks to the heroics of Duchene and Varlamov. The famous catchphrase amongst fans was "lose the corsi, win the game!" Colorado fans thought we were stuck with him until he miraculously resigned.
If you want to argue that those Colorado teams weren't very good, you can also thank Roy for that. He also held a front-office role and orchestrated the moves for old players like Jerome Iginla and Brad Stuart. Once he left, the front office began targeting young players and eventually developed into what they are now.
I've only watched one Islanders game this year, but I know enough about their roster to know it's flawed. And I know enough about Roy to know that he's not a good enough coach to overcome those flaws. And unless his comments are taken very far out of context, Roy's spicy personality is starting to rear its head.