I am not taking a position on how good of a player Barrie is, specifically, but I find it entirely plausible that a player, especially a defender, could be not very good despite putting up a lot of points. These players are like the Ryan Howard type players in baseball that were hugely overvalued 10-15 years ago because nobody could get their head around the idea that a player could hit 40 HR's and have 100 RBI's and still not be especially valuable. It's the same sort of thing. Whether it applies to Barrie or not I'm not sure but dismissing the idea out of hand because points seems specious. Barrie was -63 over those 5 years, and was pretty consistently at the bottom of the Avs in terms of goals allowed at ES. While that doesn't necessarily mean much in and of itself, it does lend credence to the idea.
This is a fascinating thought. Huh.