Good, but not brilliant like the previous novels. 
 By now Pratchett's comedic fantasy should be familiar. In this installment wizards get themselves in trouble. As such enter, "The Sorcerer". Unlimited magic might just be a little more than a bunch of stumbling, dusty wizard can handle. More Rinswind and the introduction of yet more funny characters, in the form of a rather effective barbarin (that doesn't want to be one) and a wannabee barbarian (that desperately does want to be one). 
 As for the story as a whole. It starts out great, but starts to dwindle near the end. Still good, still funny, but not as great as the previous novels.