Re: Michael Chabon
I've only read The Yiddish Policemens' Union. I didn't particularly see any literary pretensions. It was a good read, solid characters and all that. I liked the alternate history setting and the sense of failure and despair it kind of creates amongst the 'people' (I'm avoiding spoilers here). I felt the wrap up was a little bit Hollywood.
I wouldn't see it as being high literature, I think there are plenty of others who can lay claim to that first (PKD, Pynchon (as mentioned), and so on).