generalfrevious said:

I think he is upset because he had the least involvement in that movie, and it turned out to be the best.

I imagine that's it exactly. He's been a control freak forever, up to and including how the films are presented. Which is often times not the way the fan base wants them to be (unaltered, high definition). For the most part, he gets to exercise his control because he owns the rights to it all.

However, he can't control what the fans want or how they feel about the films - no matter how hard he tries. I've long suspected\assumed that his dislike of Empire is really his dislike of Empire's popularity. It's sort of an emotional pouting on his part.