I think if any given author writes enough books, some of them are probably going to be better than others. However, a good author's worst book may still be better than the best work of a mediocre author.
I find it interesting that in Goodreads reviews for books in a long-running series sometimes one person says "this was not one of the better books in the series" while another person says of the same book "this was one of my favorite books in the series".
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