Pretty sure that the advanced stat folks have some metric of shot quality and expected goals scored that shows NYR give up an unusually high frequency of high=percentage shots, and so Lundqvist has actually still been outperforming the league average even during these last two years.
I do think that the best real critique one can make of Hank is the "Clemmensson effect," which is that most backups that we have had have also put up quite good/similar numbers in his absence, similar to Brodeur for years in New Jersey. But that doesn't take into consideration quality of opposition for selected games.
If I am not misstaken, coming into last season he was at the top of the advanced stats. I think @nevesis has the numbers.