I struggled with this a little bit. I've heard people rave about discworld and from what I had heard about it, it seemed my kind of humor. I finally started reading it, and I just could not get into it at all. This first book is pretty short, but it took me awhile to finish it because I would get bored and go do something else or I'd fall asleep. 
 Part of the issue for me is the writing style. I had the same trouble with Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch. Sometimes the sentences were structured very strangely where I would have to reread them a couple times to really grasp what he was saying. It wasn't that it was lofty writing or anything; the words were just placed in weird orders with little to no punctuation at times. 
 Other than that, I just didn't feel attached to any of the characters. Even a humor/satire novel should have basic character development, and I didn't feel that happened. 
 However, I did finally get into a groove and the last third of the book was much more enjoyable, which pushed my rating from 2 stars to 3. I do plan on reading more in the series, perhaps in between more "serious" fantasy novels.