I wonder why so many have expected a direct out of the book biography just because the name of the show is "Freud". Even Freud believed that every individual is unique and must be treated that way.
Cinema is personal to the creators and interpreting for the viewers should be on experience of the senses. Although I don't judge whomsoever disapproves, I also don't agree with them.
The series is engaging, dark and deep. To someone who didn't know 'Freud' personally or through the works that he chose to publish.. ( Martha exclaims 'What's not in the book is of no importance' or something like that) we must applaud the creative genius of the script and the actors to have embodies the roles so well!
It is NOT a biography, it is a Crime genre take on the basis of the working of the mind through Freud's eyes and boy! The show Beautifully brings to light the synchronicity between mythology, the spiritual world and psychology!
Watch it with a very open mind and you'll find it to be really fresh. Like all works of art that's forward for it's time, it's cathartic in it's own right!