Terry Pratchett books are a very engaging read. Discworld books are incredibly funny fantasy tales - often with an important message.
I think in the 1980's when Terry Pratchett published his first Discworld Books, the Discworld Books, 'Colour of Magic' and 'The Light Fantastic' he didn't know quite where he was going with the Discworld theme. Discworld is fantasy, and it is parody.
The trouble with fantasy parody - is fantasy readers don't always like them. Books like 'Bored of the Rings'make fun of fantasy which puts fantasy readers off. Discworld isn't like that at all. Discworld is more about fantasy making fun of the absurdities in real life. The first Terry Pratchett Books about Discworld weren't strong on narrative - they were more like a series of Discworld sketches compiled in an omnibus - and they helped set the scene, but the later Discworld books with a stronger theme and narrative are really where the Discworld series starts to shine.
Discworld can seem absurd, but Discworld is really more about pointing the finger at the absurdities of reality. Terry Pratchett has created something unique in his Discworld books. Yes Discworld is a little satirical - but you have to read Discworld books to understand where the satirical finger is pointed. I don't know if it's true of all Terry Pratchett books, but it is of the Discworld Books and I hope he can continue to write Discworld books for many years....
Personally I like J K Rowlings Harry Potter offerings, but I only feel Terry Pratchett's Discworld Books are a better series. I suspect the problem is Discworld doesn't translate to film as well as Potter. Terry Pratchett probably doesn't mind - he's had some success with the existing Discworld films, but I think more could have have been done with the Discworld films. I would like to see Cohen the Barbarian in film. I always think Cohen was one of the strongest characters in the Discworld books, and I'd love to have seen his 'Silver Horde' taking on the Agatean Empire.
The latest Discworld Book, in fact the latest of Terry Pratchett books is Snuff, I am looking forwards to reading it.
