This is the first of Pratchett's novels that I've read to the end (I've certainly tried at least one before and didn't get anywhere) and I think I understand the attraction. Vimes is a thoroughly decent chap, in a messy world, and Pratchett weaves words of wisdom into a pretty entertaining story. I'm not sure it moved me enough to hoover up the rest of his books, but I at least understand why people like him so much.