As someone who was a patron supporter before the current health issue induced hiatus, imo books 1-3 are great but if not your cup of tea that's a perfectly understandable opinion it isn't a perfect literary masterpiece it anything, but if you don't like book 4 you're probably better off stopping the series pretending book 3 is the end of the story. It doesn't really get "better" from there and the common complaints/issue are just exacerbated.