SilverWook said:

Having read the original making of ESB book, I disagree. Whatever you think of his work before and after Empire, Kershner rose to the occasion. There were many events on the production beyond anyone's control. That's the nature of the business, you can't plan for everything.

ESB was a far more complex film than Star Wars, and Jedi is no ESB.

Well I didn't say it was entirely his fault. I said partly which I think is completely correct according to the information we have.

Yes ESB was more complex than SW in terms of on-set related production but not proportional to the eventual time spent. As for ROTJ, I believe it had the same level of on-set related complexity as ESB, or even higher due to all the creatures involved.