Matthews was probably still recovering from his shoulder issue these playoffs plus he was also facing off against Bergeron. If he could use this offseason to recover fully, that'd be great. There was this one instance in game 6 where he could have used his curl-and-drag on a Bruins defender to use the guy as a screen but he didn't. He had speed and everything...
Nylander was kind of affected by Matthews' substandard play. Several cross ice passes were flubbed, not handled cleanly, etc. That's usually the duo's bread and butter.
Marner had a good series. He'll get stronger still, and kudos to the Bruins for identifying him as a main threat, but Mitchell did take a licking and keep on ticking.
Kapanen had a coming out party but he wasn't given the kind of minutes that his play deserved. Excellent utility player that can (and deserves to) play anywhere in the lineup.
Johnsson just skates and thinks the game so well, I think he can carve out a long NHL career. If JVR is moved, he could be a dark horse candidate for a breakout year.
Dermott usually played really well and would often look like the team's best defenseman. Excellent gap control, quick puck mover... though he did have some bad games. Babcock should have played him more too.
All 6 of our youngest guys showed promise in different ways. (I could have included Rielly's play but he's got a ton of games under his belt)