Apparently Lucas didn't like Spider-Man 3, saying it was ridiculous
Here's a snippet where he mentions it.
Lucas told me he has seen all the summer movies since his company, Industrial Light and Magic, does most of the special effects. The only one they didn't work on was "Spider-Man 3." What did he think of it?
"It's silly. It's a silly movie," he said. "There just isn't much there. Once you take it all apart, there's not much story, is there?"
Well, it's not "Star Wars."
"People thought 'Star Wars' was silly, too," he added, with a wink. "But it wasn't."
I can only imagine Lucas giving a wink. For some reason the image disturbs me. not to mention his whole statement seems a bit ironic coming from him.