On defense compared to last season. Gio in over Dermott is a major upgrade. Sandin and Liljegren are another year more experienced and proven. The defense looks better this year than it did last year. They have a top-5 league defensive unit.
At forward they've lost Mikheyev, Kase and Spezza. They are players that can bring a lot of offense and they brought good defensive ability and the ability to PK. They've replaced them with Malgin, Aube-Kubel and there may still be another forward out there that they may sign. If they don't sign anyone, I would assume the other roster spot is Robertson's to lose. This is a big question mark going into the season. How much can you get from these guys. Even, if you sign a Motte, ZAR or Strome.
In net I think we came away with an upgrade at the backup position. If you told me at the start of the off-season that Samsonov or Murray would replace Mrazek I would have been fine with that. When it comes to one of them being a starter I'm very nervous that either of them can pull it off. I think Jack was a gamble to maintain his high level of play, but either of these goalies are far more risky.
In summary, I think the defense being pretty much perfect on paper to start the season and the big 4 being in top form should carry us to the playoffs rather easily. Goaltending and bottom-6 forward quality are big concerns going into the season. They may need to address both before the deadline.