I enjoyed watching this, as Franz Kafka is probably my favourite autor. I have read almost entirely his work and, something that would shock, disgust and give him anxiety were he living today, I also read the letters to Milena and Felice.
The TV show gets a lot of things very right: his friendship with Max Brod, his broken relationship with his father, his love-hate relationship with his job, his struggles with conforming to society's expectations.
Why I don't rate it higher: I think the main actor cast for the role of Franz Kafka is too far from the historical figure. Franz Kafka was a Jewish man, with very dark hair, clear features, very tall for the era (over 1.80), who saw himself as very fragile while in fact he was considered quite healthy and good looking. And certainly extremely well dressed, considering his father's line of work!
Moreover, he was a dreamer who didn't adapt well to reality, but in no case was he a clownish figure. He had humor, but I am sure he was well aware of his imense talent and was quite ruthless when reviewing other work.
All and all, I am very happy for this production, but I fear no other greater work will appear for some time :(