I'm midway through my second reading through the Discworld series. Several years ago I discovered that they were just the right mix of interesting enough to read yet sedate enough to not raise my adrenaline that I could read them and reliably fall asleep within 5-15 minutes of going to bed. This was a godsend because prior to discovering this, it took my brain anywhere between 1-2 hours EVERY night to settle down enough to actually fall asleep, if it ever happened. Lifelong chronic insomnia solved!

(I'm not sure this is the glowing review that most authors aspire to, but here we are.)

Anyway, MOST Discworld books are well worth the time. A few are difficult to follow because Pratchett tried a bit too hard to rely on context. And he often reuses major plot points. But the narration and dialogue are more than clever enough to make up for any of these.