The Pittsburgh Penguins as a whole registered a -17 goal differential. Sidney Crosby and Kris Letang lead the NHL with -14 ratings. Hockey is weird. Given that Sid and Letang have been playing the most minutes at their positions, it makes sense their +/- has suffered.
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The Pens are pretty middle of the road offensively at the moment, ranking 17th in the NHL in total goals scored. They also rank 30th in goals allowed with 67. Only Arizona has allowed more. And Arizona has won two games. Yikes.
A few blowout have really mired some of the team stats to start the season, but it is worth noting that when this team loses, it can lose big.