You're talking about
Ken Krzywicki's model, right? I think you misread his numbers. SQA refers only to the average shot quality against, it's not a shot-quality adjusted save percentage. According to this model the Devils allowed the fourth easiest shots in 2010 on average, behind Minnesota, Columbus, and the Rangers.
aha, so I had it backwards. And the reports on Mason (whom I rarely, if ever, saw, but always heard was struggling) were in fact correct. the way I interpreted the results of this study was that although his numbers looked bad, Columbus was allowing very difficult shots. as it turns out, Mason was struggling in spite of easier shots, not because of tougher ones. I also assumed Rask's numers coming down to earth were feasible because there's been a lot of talk about Boston making goalies look better (which may still be true)
I also found it pretty plausible that New Jersey's now-anonymous defense was allowing much greater shot quality than in the past, when they were typically allowing the easiest. I guess it doesn't affect Brodeur's 2010 results that much either way since his sv% was one point off where shot quality adjustment said it "should" be. But it does affect the goalies around him.
I'm surprised this study wouldn't give a list of adjusted save percentages. I didn't read closely enough and misinterpreted. I just did a simple "actual minus SQA" calculation and determined that among 31 goalies with a realistic shot at the Vezina (1000+ shots), Brodeur was pretty average, with a sv% .001 better than expected. I'd definitely give him credit over lesser-used goalies ahead of him like Pavelec, Theodore, Niitymaki, Ward, Hiller & Hedberg (though it should be noted that Hedberg is outperforming Brodeur on the same team this season)
I retract what I said about Mason and Backstrom. The best goalies last season, with sample size and sv% relative to shot quality considered, were Miller, Vokoun, Nabokov, Rask, Howard (the degree to which he outperformed Osgood is considerable!), Bryzgalov, Halak, Kiprusoff, Lundqvist, Anderson, Brodeur, Hiller, Luongo, in rough but flexible order.
Brodeur clearly had an above average season but I don't see what made him a deserving finalist either, aside from reputation.