Even though he said that, I didn't accept it. I don't know where he came up with the always saying he was "only happy with something like 35% of the films". He didn't start talking like that until recently. I remember him saying that he originally planned to do nine films and they would all be told from the eyes of the two droids. I also remember him saying back in 1982 that he was really upset how he was forced to release Star Wars on VHS and how he hated Pan&Scan. Because of that, he said he wouldn't release Empire of the upcoming Jedi on home video until some ridiculous date like 1999 or something. I don't remember the date, but that obviously didn't happen. Also remember the excuses he made for deciding to release the films on DVD before Episode III was finished.
With Lucas it is always either a denial or excuse. Never, "Well, I changed my mind." or "I was mistaken.". Hell, if I am wrong and I realize it, I will say, "I was wrong.". I really wish I could dig up all of these articles and interviews. Some are easy since they were made more recently and on the Internet. However, some will be hard to find, because they were in printed material many years ago. I'm not the only one who read this stuff though, so I know there are others my age who probably know where to find the articles.
Patrick