When I rate a movie, I rate on how it entertains me. Documentaries serve a different purpose -- to inform. How do I rate "the ability to inform"? How do I rate "the construction of a documentary on subject matter that may or may not interest you anyway -- which is why you're even watching the documentary"? I can easily rate the ability for a film to inspire/entertain/etc me, but I've never felt I could put a rating on a documentary.
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