I think Berry is a decent coach. As long as he has strong senior leadership on the team to keep things in check and discipline the players when necessary. I think Berry is great at motivating the players when everything is clicking, but struggles either figuring out what part of the team chemistry is out of whack, or simply not being able to change it.
Hakstol, on the other hand was great with the discipline, and could prepare a team for late season play, but just couldn't motivate the players to finish the season.
At least that's my 2 cents worth.