The problem with the "but George was just writing it the way teenagers really talk" defense is that these aren't supposed to be depictions of "ordinary" people doing and saying "run of the mill, mediocre" things. This is supposed to be Grand Romantic Myth, a romanticized, idealized portrayal...
Mostly agree with Lou's rankings: The Empire Strikes Back A New Hope A medium size quality drop Return of the Jedi A much larger quality drop ROTS A major quality drop AOTC Further drop TPM, because of Jar Jar and the meaningless portrayal of kiddie "Annie".