Puggo - Jar Jar's Yoda said:

Good movies don't answer questions, they raise questions.

It can be done, if you're really really good - like 2001 a Space Odyssey. We never truly learn who was behind the creation of the monoliths, etc., and it's still satisfying and wondrous. Keeps you thinking about the movie for years to come. But come on - Star Wars is based on Flash Gordon. As trancedent as the OT was, the whole saga's batting average is pretty damn mediocre with the PT out there. Arthur C. Clark it ain't.