Y'know I'm watching ANH right now and I've made one observation. Knowing what I know about the prequels, Obi-Wan is one of the most interesting characters in the film. When he sees Artoo for the first time after saving Luke, he gives the droid a long hard look. As if he was thinking to himself, "I've seen this droid before." Revisionist yet cool.
I used to never even consider Obi-Wan anything more than a storytelling device to fill Luke in on the plotline. But now, with the prequels, he has become as much of a real person as any movie character can be.