Overall, I agree Matthews has been a playoff disappointment. It was just that one game against Boston where I thought holy shit, this is it, this is what we've been waiting for, just an absolute beast and then ... he got hurt. I'm hoping he can reach that level again, and of course sustain it for an entire playoff run but considering his history, I wouldn't count on it so it's nothing more than a dream ATM.
I think Nylander's been just fine in the playoffs last few years but the rest of the core, just garbage. JT and Marner have been just terrible and Matthews while not as terrible as those two has still been pretty bad considering his cap hit suggests elite performance.