I've read only the first page so far, but the author already seems to contradict himself. He says the ending of TPM is similar to the ending of ANH, but later he claims that TPM mirrors ROTJ.
If Lucas really intended to tell his saga in a ring structure he failed to implemet it properly and he failed to make the prequels actually good movies. No matter how elaborate his plans for the structure were, the stupidity of the prequels ruins any enjoyment you could get from "understanding the larger context".
And to imperialscum: Blaming Lucas is not blaming the ice cream, it's blaming the one who made the ice cream.