I watched the entire series. I thought the first episode was a bit slow, but it really picked up after that. Overall, I liked it.
I thought Timothy Hutton’s acting was fine.
I had read the book, so I was expecting something more along the lines of a modern take on the book’s plot. Instead, about the only thing the book and the show had in common were the setting (the haunted house) and the names of the caretakers. I guess Theo being a lesbian was a call-back to the book as well. I would say that the show is more inspired by the setting of the book than being actually based on the book.
It’s a good book though (IMHO), if you haven’t read it.
One thing I really liked:
Episode 6 is a series of exceptionally long camera takes. It gives the episode a unique feel, and must have been very difficult to pull off from a technical perspective. Very well done.
I also liked:
The bent-neck lady twist, referenced in the OP.
One thing I didn’t like:
The ending. It was too happy. It wasn’t a completely happy ending, of course, as you find out that Abigail was real and the Dudleys just lost their daughter. But in the end Mrs. Dudley goes to die in the house so she can live happily ever after with her daughter. The house is supposed to be an evil monster that devours people, and all of the ghosts (at least the ones we care about like Hugh and Olivia and their daughter Nell) live happily ever after inside the monster house. Even Luke survives after injecting rat poison into his arm. All of the happy endings didn’t fit with the tone of the rest of the show.
It was also very out of place when compared to the original book ending. (BOOK SPOILER - STOP READING NOW IF YOU HAVEN’T READ THE BOOK) The book ends with Eleanor, the main character, crashing her car into a tree. Definitely not a happy ending. The book also left it ambiguous as to whether the hauntings were real or if Eleanor was perhaps mentally disturbed and it was all in her mind. The show would have been much better if it had ended on a similar ambiguity, given how mental illness and whether or not their experiences were real or hallucinations was a major plot point throughout all of the episodes.