Like someone had said before (and even Lucas himself) that the PT's would've made Obi-Wan the focal character, and we see all from his perspective.
In some respects, like another poster on ORS (formerly TFN), Binary Sunset, he would've been happy with a "Die Hard" ending where Vader comes after Luke on Yavin, they duel, and Luke beheads the monster who killed his father.
I would've been perfectly happy if Star Wars had ended on that note..... of course, we insatiable fans still would've begged for more.
