I'll grade each player separately, and then coaching and management.
Thomas: B+ three shutouts which is only two less than he had all last season, solid stats. It's hard to tell how much of some of the bad games were his fault and not issues with players in front of him, but there were clearly breakdowns in his play here and there.
Rask: B. He's had a solid set of games, mostly against poor teams the Bruins should be able to beat easily. There is already a book on him, and it shows in how players shoot at him. He has compensated for the book, but his concentration is very sketchy towards the end of the game and he needs to remember not to start thinking about the post game shower and such until after the horn blows.
Stuart: B, he hasn't contributed to the offense as much as he did last year, on the other hand he's not getting that much top four time as the D has been healthier by far this year than last. He's mostly been solid.
Wideman: D- He's been horrid with occasional flashes of merely bad and rare glimpses of competent. His collision with Hunwick is only one of the many gaffes that should have earned him a trip to the press box for a few games.
Ference: B He's been healthy so far, and has had only one or two bad games but has been mostly invisible in a positive manner, which is all you can ask a third pairing stay at home defenseman.
Morris: B- Inconsistent as hell in the early going, and has made a few turnovers, but is also tied for third in points. Has used his hitting and skating well, but has made some really questionable passes.
Hunwick: B- Needs to show more awareness of his d partner, and needs to shoot more from the point, but has been very reliable.
Chara: C- Has not been the game changing monster he can be except maybe the game when he scored his first goal. Has had a couple bad, bad games while adjusting to a new partner and been invisible most of the time.
Boychuck: Incomplete, which seems to be the story of his cameos in the NHL.
Krejci: D I'm tempted to give an incomplete since he didn't have a preseason, but one of the hallmarks of his game last year was an ability to touch pass mojo to anyone on his wing last year. He not only isn't scoring as much, neither are his linemates.
Sobtoka: C-/Incomplete (see coaching grade) he's looked good with some linemates, leads the team in hits, and has been solid in his own zone, but offense is not something he's generated much of.
Marshand: Incomplete: Some good flashes, and a lot of invisibility. He's not strong enough to play in the NHL and be effective yet.
Recchi: D, his offense has been almost entirely absent but he hasn't made any stupid turnovers and is doing stuff away from the puck. Needs to shoot more, looked out of shape the first 10+ games.
Ryder: C- has done most of the right stuff away from the puck some of the time. Has finally started to warm up the scoring but has not been a factor in games when he didn't score like he was last year.
Wheeler: C+ Has been consistently doing the stuff away from the puck that makes him highly valuable. Fails to use his size to get more space, and has not made any of the pretty goals he did last year. He needs to shoot a little more, and hit a lot more.
Savard: A/incomplete. For the time he was on the ice before being injured he was amazing.
Sturm: C+ Like Wheeler he has been doing stuff away from the puck more often than not, has won battles along the boards and not been a negative, he could almost get the same comments as Chara, he can be more but hasn't been.
Begin: A (and it pains me to say that) He has been one of the four or five most effective players on the ice all season.
Lucic: D+/Incomplete. Was a non factor in his first six games, and looked solid in the two games since his return. Needs to remember his game.
Bitz: C Has been the worst part of the best 4th line in hockey. Some screwy passes and sloppy skating show he belongs on the 4th line, some genuinely deft passes and scoring show he could earn a higher slot if he can stay focused.
Thornton: B- has done nothing hugely wrong, but needs to be a bit more obnoxious to the other team when not fighting to keep them off their game.
Witfield: D- Invisible in any useful manner, the fact that he was only a -1 in seven games is a testament to the players around him, his signing is a big blackmark against the management.
Paille: A- has helped make the penalty kill solid, has great speed, makes smart decisions with the puck and is not prone to taking nights off.
Bergeron: A+ Despite no consistent help among the forwards, he's been from well above average to elite in all three zones and situations all season. And again, despite the lack of support is on pace for 26 goals this season, which would be his second highest total. If he has just two or three multi-point games he could beat his previous high of 31.
Kobasew: C- (see management grade) Went from a drastically under performing team to a drastically under talented team and has done not much all season. Was not the problem in Boston, is not the problem in Minnesota, but can be better.
Coaching: C. The team is above .500 despite injuries, departures and new arrivals. Made some poor calls in tearing apart lines that were very effective, in particular the Paille - Sobotka - Wheeler line before the Detroit game. Playing a team that loaded with talent and veteran savvy with lines not familiar with each others habits is a recipe for disaster. I also don't think they have been aggressive enough in sending messages to veterans who have underperformed at this point at least one name player should have earned themselves a trip to the press box.
Management: C. They made the right call in not overpaying Kessel, and got a solid return for him. They made the right calls in bringing in Morris and Begin. But they made the wrong calls in letting so much veteran leadership go and the on ice product has suffered from so much of the regulating personalities go. I can live with letting Yelle and Ward go, they weren't contributing much and the latter seemed to get injured every ten games. Hnidy was not the best defenseman on the team, and could have gone too, but his reasonably even keel on top of Axelssons are quite noticeable in their absence. PJ would have been more valuable than Recchi has shown himself to be this season, and perhaps the Bruins wouldn't have needed to spend the draft picks to get Paille. Letting two of these four guys go is no big deal, and Hnidy could be just as effective a healthy scratch as Boychuck but all four is inexcusable shortsightedness.