Huge fan here. I've been reading Discworld novels since I was 8 and I've read almost every single one of them (except perhaps two or three) I really love the City Watch series :3
City Watch was my least favorite because I thought what was so interesting about police, too mundane for me! Now I think it is one of the better written series, guess people's taste do change.
Hah, kinda same here, I used to like the witches better, but then something happened; I don't know, I guess my taste changed too. It's so sad that there won't be any more books now that Terry Pratchett has passed away :/
I'm a huge Terry Pratchett fan! My favourite arcs are the Night Watch and Tiffany Aching series (mainly because of the Nac Mac Feegles). I also really like the witches and the series about the gnomes in the department store.
Tiffany Aching for me was the most enjoyable to read because it was targeted at younger audience...the language was simpler but still full of wits. Ah, I want to reread the series again, it's been a while.