The Pratchett's I have read seem to be full of basic human archetypes, riffed off for comedic effect, rather than anything approximating how real people think. He's no Shakespear/James Joyce/Henry James.
I was not a fan until I recently re-read all his work - but I dont think he ever would have claimed to be a shakespeare or a Henry James. I would say a more apt comparitive group would probably be Rabelais, Swift,Verne, Vonnegut, Voltaire, Wells, Wilde and Woodehouse - all of which he certainly is an equal writer to and his overall body of work sits well with.
