I watched Games Six and Seven.
In those two games, the Detroit Red Wings' offense was flatter than Kansas (and since I lived in Kansas from 1974 to 1981, I should know).
Maybe it was just being tired or maybe the Pittsburgh Penguins just played great defense. Probably a bit of both. In Game Seven, each time Detroit seemed to get the puck near the Penguins' goal, they were swarmed by defensemen. It's like chess: when you surround the king and create an impenetrable defense, you will be very successful. I also remember one power play where one Red Wing tried to skate through a swarm of Penguin defenders instead of getting set up for a clean shot.
Congrats on the Stanley Cup, Penguins, and maybe Sidney Crosby will become the savior that keeps hockey in the Steel City.