Uhhh just about all of them since the films came out...

Apart from the, "you can type this shit George but you sure can't say it" comment, he's always gone on record as saying what fun they were to work on, plus the fact they combined real storytelling & characters you cared about with special effects. I always get the impression he was very pleased with the way the films turned out, although he was disappointed he didn't get to kill off Solo in Jedi. I never sense any embaressment from interviews with him about Star Wars over the years. I think he's proud of his part in them. Occasionally he gets a bit sarcy about them but that's Harrison isn't it, plus getting bored of the same questions being asked again and again over the past 30+ years.

Then again perhaps I'm just talking out my ass...

http://www.youtube.com/watch?v=sWTtMdXAazs&feature=player_embedded

;)