I haven't seen it, although Capo liked it. As for these types of films, I think this quote is one I agree with.

"How could we possibly appreciate the Mona Lisa if Leonardo had written at the bottom of the canvas: 'The lady is smiling because she is hiding a secret from her lover.' This would shackle the viewer to reality, and I don't want this to happen to 2001."
--Stanely Kubrick

A weak defense I know, considering it depends on the film, but still.