What that guy said, Manic Street Preachers made arguably one of the greatest albums ever made, but their discography is also filled to the brim of 5/10 albums.
Yes, Star Wars dips in quality, yes the prequels are an absolute mess of cinema that should never be reviewed at 2/10 or over (even though most major critics disagree, as do I), and honestly yes people do tend to overestimate how much of a big deal Star Wars is, but a bad fanbase or a bad series doesn't stop a great film from being great anymore.
EDIT: As much as that guy also had dumb reasoning, he's so right about American Graffiti, that film seriously needs more love.