The book is starting to have a terrible quality, until it starts to improve in quality.
Until the author decides to remake the story and it becomes horrible.
Until the next book, where it degrades in quality and becomes horrible again.
Parodied: The book is used as a torture method.
The book starts out being critically panned until someone writes a glowing review saying that the whole thing is a parody and not meant to be taken seriously. Little does anyone know is that the author didn't mean for it to be a parody...when he wrote it, that is.
As you read on, the book constantly switches between chapters of cringe-inducing awfulness to hilariously bad ones that make you wonder if it's a Stealth Parody.