One Dean Koontz book isn't a great sample size. He writes a LOT and most of it isn't very good, but every once in a while he gets it just right and puts out a really good one.
Though tbf, I haven't re-read his stuff in probably 10 years so I don't know if it holds up to modern scrutiny. Odd Thomas was always my favorite of his.
Who is John? Everyone knows JRR Tolkien stands for Jolkien Rolkien Rolkien Tolkien.