now I don't know if he based all off it off everything they've been saying, but think about the names (ie Naboo, Jedi) that are directly taken from other culture's myths and that he took the name storm troopers from Hitler, that stuff can't be a coincidence.
And as far as Shakespeare goes, I tihnk he deserves most of the credit he gets, I mean he invented lots of our every day language. And social commentary is not uncommon as far as story writers go. It's just decent social commentary that is. If you want to say anything about him, say that he took almost all of his stories from existing myths and stories, that he did.
/mini rant
Fincham: Where are you going?
Me: I have no idea
Fincham: I meant where are you sitting. This wasn't an existential question.