We will never know if PH was a bad coach. What I do know is that he asked his players to do things that they could not do, at least on a consistent basis. I'm not sure if that really reflects on him as a coach, or the roster? He did not change what he was asking of the players after it was obvious that they could not deliver it.
It won't be a fair comparison if PH coaches another NHL team ever, since the players will be different and the results will likely be different.