Horribly miscast. The jokes didn't land, for the most part. They keep referring to 'callbacks' in the show because there is nothing left of Terri Pratchett's charm, wit or intelligence in the show. The actor playing Vimes keeps gurning and mugging for the camera - a directoral choice, I am certain. Angua is not Angua, and her accent makes her hard to understand. Deitritus' voice is pitched low and slow - I imagine they thought it made him more 'rocky' and 'gravelly' but that, too, makes him hard to understand. Cheery is...not Cheery. Vetinari was a poor excuse for an adaptation, and felt fake and shallow. Lady Sybil - there was just nothing left of the character there.
The pace was inconsistent - sometimes I was thinking 'Get on with it' and others 'What the hell just happened'. Why does Death have a 'Motown Cool' voice and rhythm of speech? Why was Buggy Swires (a gnome in the books) a throw-away HUMAN character murdered in the first 5 minutes of the show.
And they have iPads? They must - unless it's some magical element that they refused to explain. Vetinari's palace, rather than looking like what it should be - A PALACE - looks like something out of Dune, or some other Sci-Fi show. Nobby and Colon, characters that have been in EVERY Watch book since the first one, are nowhere to be found. Goblins are human-sized?
Captain Carrot was almost SKINNY, and he even referred to himself as 'carrot-shaped' early on...which he IS NOT. It also suffers from the 'The Audience is stupid and won't figure this out, so let's set up exposition with one character explaining things to another character' - except when the character doing the explaining has a thick accent, and is speaking quickly to get all the exposition out, IT GETS LOST, especially in the background noise and music.
You should all be ashamed. Someone go to Sir Pterry's grave with a chain and a dynamo, because all the spinning there could be harnessed to power this fake, sad, ridiculous electric Ankh-Morpork-wannabe city for years. I'm so sorry for this, Rhianna and Neil. Sir Pterry deserved so much better, and so does his work.