My Experience
¥One of my nephews, however, had read the books, and he said they were quite good and I should try them.
¥I did.  They were good!
¥The first thing I noticed (having taught apologetics for years), is that the books were surely not written by an occultist.
¥The author passed up numerous opportunities to dump on Christianity, e.g., by making the Dursleys Fundamentalists, Catholics or Anglicans.