Finished it the other day. its... well, its *good*, but... its not great. It just feels like theres something missing. I don't know whether its the characters, or the plot or anything else, but it feels kind of...meh.
that said, I still enjoyed reading it, which is par for the course for Pratchett. And 'mister Nutt' is awesome.
'come on if you think you're hard enough'