I said it makes you qualified to judge its value as art. You can judge it to be bad or good. If you don't understand it (unless you're convinced there's nothing to understand...ie the movie was pointless), then the best you can say is whether you enjoyed it or not.

I don't understand bebop, but I enjoy listening to it. I couldn't tell you what's bad or good bebop because I don't understand it, I leave that to people that do. But I can tell you which records I enjoy listening to and which I don't.