Used to teach film history, so I've seen it a hundred times before--the syndrome where you show them something like The Godfather and they go: Man, what a rip-off.

It's still not a reaction that makes sense to me; I find that really amazing art, whether visual or cinematic or literary, does not lose its effectiveness even after it's become a cultural cornerstore and been imitated, quoted, homaged into infinity: otherwise no one would ever bother to watch Casablanca anymore.