The musicians were very variable, which was a mistake. Chuck thought that everyone had come to see him, which was true, but he soon got a reputation for putting on poor gigs. In a way he wasn't wrong because despite taking the piss he still managed to work for over 60 years.
Chuck didn't have a set list or announce the numbers, he just started playing and his songs were played in C, Bb, Ab etc, not in guitar keys so some bands had a big learning experience.
I don't watch Chuck Berry live for the above reasons, but I have most of his records.
You can't imagine the earthquake they caused in the minds of musicians around the world in the 50's and 60's.