I checked and we are .577 since January 1 (Post Hynes). We are above Capitals, Penguins, and others. Sitting in 14th spot. We would be fighting for a playoff spot right now.
It's very hard to pin point what was wrong with the Devils, but it seems now it was a combination of everything:
Bad coaching. Not necessary technically, but you could tell players were not playing for him.
Player mismanagement. Keeping Hall on a team, while his teammates knew he is not going to be a Devil was a cancer. Exactly same thing happened at NYI. Tavares goes, and team recovers.
Possibly bad goaltanding along with goalie mismanagement. They gave up on Cory too early, while everything else was wrong.
Bad roster (bad trades for PK Subban), but not as bad as people assumed. We have a worse roster now (on paper at least) and we are doing fine.
Playing Hughes top line minutes at center.
Probably few more hidden problems.
NAS has done a good job as a coach now. He may not be great, but he seems like a father figure who calmed them down, and put them together to play more like a team.
To bad, because bad GMing stole a season. Chances are it was like that every year there and we might not even know. Being good GM means a bit more than trades and draft. You still have to put in people that jell everything together including the coach. Can't have negative attitude in the organisation (locker room, with staff, with owners, etc).