The Colour of Magic

Much as I love Terry Pratchett, this is definitely a case of him finding his feet. You can see all the elements that made some of the later books such classics, however there are also plot holes and a general scattershot feeling. This is a pity because people often feel they need to start at the beginning of the Discworld series and are put off by this lackluster start (although, when I originally read this in my early teens, I thought it was one of the funniest things I had ever read).

My advice: start with something like Wyrd Sisters, Mort or Small Gods and then leave this one for when you want to complete the set.