The book seems to be trying to present a philosophical argument and to be a work of fiction at the same time. It succeeds at neither.
Philosophically, Robert Persig is presenting his idea of the Metaphysics of Quality as a philosophical concept. Yet he uses the emotional tie-ins of his fictional story to sell the idea. From the start, it bothered me that his use of Quality is quite different from our usage. I would think another term would be more appropriate, but I believe he wants us to associate his idea with our idea of quality without having to say it.
His initial ideas are interesting, and it started to look like it may have some merits. However, after the mid-point of the book he tries to sell rather odd ideas. He redefined science from a set of objective truths to subjective truths, because that fits better in his philosophy. Now science can have different truths in different cultures, which is the opposite of the goals of science.
Psychology, likewise is defined as culturally dependent. He sells his ideas using Lila, a psychotic young woman who responds beautifully to the predictions of his philosophy. She is not likable and not very believable. Some of her behavior doesn’t feel consistent, the author would describe her as following a value system that is not consistent with that of society, but has “value”. In his philosophy, value comes from experience.
As a work of fiction, Robert Persig is constantly talking to the reader. The characters are one-dimensional and I eventually lost interest in them.
It only got worse. I have not been able to finish the book.