The central theme of Zen and the Art of Motorcycle Maintenance (ZMM) is debatable, but Pirsig talks a great deal about the concept of "quality". I do not like using this term since it can be confused with our traditional sense of quality, but we'll use his definition here.
Not everyone had such unfavorable opinions of Hutchins. Carl Sagan said that he was "lucky enough" to have studied under him, "where science was presented as an integral part of the gorgeous tapestry of human knowledge."
In conclusion, I thought ZMM was a complex novel that was rewarding, but it demanded an investment of time and energy. I am glad to have read it but I would not recommend it for most people.