have you seen the team he is on, he is on one of the worst teams in the league, of course his WAR rating is going to be skewed
I'm fairly certain that these cards minimize the impact a player's teammates have. So the low numbers don't come from being a Canuck, they come from being Luke Schenn.
Even still, the Pens' poor defense isn't going to be fixed by aquiring a 3rd pairing defenseman from a different team that's terrible at defense.