You would be correct if the movie was made purely for its entertainment value.
But when Lucas injected politics into it, it became fair game for criticism at all levels.
I saw the movie this weekend. I think that people often overanalyze movies, and expected this to be the same.
That bit about only the Sith dealing in absolutes was just kindof stuck in there. It didn't flow with the conversation, it wasn't derivative of the Jedi philosophy...and it was delivered in apparent stiff isolation.
In another scene, Vader crushing the stuff in the room was cool, and then he went to over-the top, bad Frankenstein's monster stuff.
Overall, the movie was visually cool, but every so often, something was just discordant and poorly done, often with apparent political commentary.
The part about "And this is how liberty dies" actually did fit though, despite complaints.