The Bruins head coach Sturm did a remarkable job. He developed a system to make up for the B's weak offense and it worked. At least it got them into the PO's. It didn't hurt that the B's had Swayman, IMHO, the best goalie in hockey.
Btw, I believe Sturm should receive the Adams award as best coach in the NHL for the season. PO's don't count in the voting.