After the two previous books were largely a parody of the state of the fantasy genre in the 1980s, I think this book is where Pratchett hits his own stride.

I think the book still isn't quite five stars because it ultimately feels slightly under-baked, not landing a great conclusion from its promising opening, but it's still a big step up on the previous two entries, and feels like the first true Discworld novel in many respects.