Thinking about it now, I realize that I've seen most1 of the episodes at midnight (or later) shows; so it really was a good way to round things out. And honestly (and somewhat surprisingly), my affection for the series is great enough that even though I know that the new trilogy (especially) isn't good, I still can't help but like the movies. And there's no question that Revenge of the Sith is better than the Phantom Menace and Attack of the Clones (and possibly Return of the Jedi, too).
Along with the John Williams score and the consistent competency of R2-D2, this one pulls the whole thing together; so I'm happy to overlook all of the silly parts.2
related: Weekend Edition had a neat story about the music of Star Wars this morning [npr].
(1) possibly all but Attack of the Clones?
(2) even the unintentionally hilarious transformation of Palpatine.