Jar Jar Binks is when Star Wars jumped the shark.
Agreed. That was the point SW went from solid Sci-Fi to 12 year old comic book status.
Disagree. It was when the ewoks showed up. Jar Jar just put the final nail in the coffin so to speak. That said the whole thing was aimed at a juvenile audience which was what the old time serials were as well. I know there were a lot of other influences but the direct reference at the beginning was always the old time serials. Flash Gordon being the most obvious.
That said some juvenalia is more palatable than others. Yoda for some reason adults could take while Jar Jar just needed to remain in his home under the water.