Matthew Barney rarely leaves one ambivalent; in fact, it’s hard to think of a living artist quite so polarizing. On the one hand, you have people like New York Times critic Michael Kimmelman declaring Barney “the most important American artist of his generation,” and on the other hand there’s the Village Voice’s Ed Halter using words like “masturbatory,” “ritual self-involvement” and “superficial foofery.” How it is that he is the subject of such a…