A passage from the Guardian that sums it all
“…If you’ve never read Discworld, then perhaps you’re unaware that what started out as a very funny fantasy spoof quickly became the finest satirical series running. It has dealt with – among many other topics – racism, sexism, journalism, death, war, the army, the Inquisition, the ambiguous nature of good and evil, and the uncomfortable power of narrative, all in novels that are smart, hilarious and humane. Come to think of it, if you’ve never read a Discworld novel, what’s the matter with you?”
The rest of the article, here.