I think that's the simple reality that if you take the works of any author or artist or director long enough...they are probably going to disappoint you are at some point.I get that. ZS use to be a no brainer for me about 15 or so yrs ago. Now, not so much. This surprised me.
Creating a piece of work that enthralls and captivates audiences is a huge thing.....expecting to happen again and again and again for years and years may simple be too high a bar for any creative person to succeed at