I've got mixed feeling about him personally.
On the one hand, he did as well as anyone could have asked given the situation he walked into.
On the other hand, there are some things about his style and approach I don't like. Some examples...
They give up the puck more than I'd like... Maybe that's my own personal preference but I've never seen a team chip more pucks off the glass and out. This used to be a possession team, now they're a chip and chase team.
He was not the pro "youth" coach people expected him to be. In fact, he was 100% the opposite. During the regular season, all of the young players on this team played less under him than Julien. And they played less and less as the season wore on. Playing dependable guys like Moore and Nash over Vatrano and Spooner helped them win and get into the playoffs, but the future of this team is the youth coming along. Guys who can step in and be difference makers on their first shift in the NHL (guys like McAvoy) are few and far between. Most young players need to be worked in slowly and consistently. Will he do that? Will he give Cehlarik or Czarnik or DeBrusk a chance to play regular minutes next year? Why didn't he do that for Vatrano? (Fwiw, I'm not saying he can't or won't do those things, I'm just saying, he wasn't as pro youth as I'd hoped or expected, and it makes me wonder how he'll be going forward.)
Playoff performance... Let me just say I don't put that series on him by any means, but again there were some things I wasn't crazy about... I felt like Boucher knew Cassidy wanted to make plays from below the goal line so he'd have his D leave the front of the net early to pick off cycle passes, and the B's never adjusted or changed things up. They kept trying to force plays down low, and if you watch the tape this is where most of our offensive sequences got broken up... The too many men penalties don't look good on the coach or his staff... There are a few others but the last one that sticks with me is that I felt like we weren't physical enough in this series. I thought it picked up a bit in Game 6 but I didn't get the sense that we were trying to punish Karlsson enough. He played all those minutes and I consistently saw guys pull up rather than finish their checks on him. Is that not part of every team's game plan? Punish the other team's best players? They certainly targeted Marchand and Pasta.
I don't know, like I said, mixed bag for me. He did a lot of good things too. He got their attention and helped get them into the playoffs. That deserves to be rewarded... I think it it were me running the ship, I'd still look around just in case somebody blows my sox off, and if not I'd offer him a 1 year deal. Why only 1 year? Well, I'd like to see some of those questions answered. And it's not like he's going to be getting multi year offers from other teams. So why not? Why commit to multi years if you don't have to?