Interesting post. I don't disagree that the Sabres didn't look out-matched so much as they looked ill-prepared. The beginning of the first and then there were several solid minutes in the latter half of the second where, I thought, they looked solid.
As I posted earlier, I really think you can summarize the game as: Eichel wasn't ready, KO is over-rated, and coaching was still on vacation. There were several good things going on and some aspects of their game were clearly improved.
I think the disappointment in the leadership group, under-rating the Bruins skill/experience, and the score have combined to make it probably seem worse than it was.