I haven't read the book but come to this as a Pratchett fan and in response I can say that it's not bad. Not amazing, but not bad. It joins a glut of recent supernatural/fantasy/religious shows like LUCIFER and PREACHER although this one's notably family friendly. Nice to see there are only six episodes so it stays fast and funny and a big cast do justice to the complex, almost madcap end-of-the-world story. A shame there's so much emphasis on Sheen and Tennant and their constant and repetitive mugging to the camera, but then you can't have everything.