I've recently completed getting soundtracks for all six films*, and recently had a sort of playoff with the LOTR films. I eventually got bored listening to LOTR, but Star Wars just pulls me in and keeps me, at least, interested. Even with Ben Burtt's bad editing. For me, it's that even scenes like Obi-Wan and Qui-Gon sitting around on the Trade Federation battleship get interesting, fairly complex music. On the film, they're not doing much of anything; they're just sitting there. But the music suggests that something is about to happen, and sure enough, it does. * as in complete.