Amongst the many underperforming players on our roster, Slavin has been the most disappointing to me. Unnoticeable at best and actively bad at worst. We need our best players to play like it if we're gonna have any chance.
I think we're seeing why defensive defensemen tend to not get much love on a historical scale. You get the most exposure during the playoffs, in which the talent of the competition natural spikes
especially among the top line competition. The only elite facet of your game is put under the microscope at the time when it is at peak difficulty to perform, and if you can't neutralize the most elite offensive talents of the game it becomes quickly apparent you don't have much else to offer.
The other factor that's Slavin specific is I think he does his best play when against a unit that plays primarily through a single player, that he and J. Staal can follow around all game and effectively neutralize. He doesn't do as well against teams with multiple elite players with chemistry, nor against really structured teams that can cycle and pass in lieu of trying to out talent him. Think Panarin and Barzal vs. Ovie/Backstrom/Kuznetsov. Boston happens to fit both qualifications, it's a horrible matchup for Slavin.
Other than that, much as I love Hamilton he (I think it was him) had another dumbass play, dumping it in while one guy was very offside with an empty net while 2-3 other guys were going off on a line change. Sad, he was a top-3 defenseman in the NHL this year before his broken leg.
Praying for Svech, though
@Anton Dubinchuk 's avatar is once again relevant.