The episodes were rather long, but the writers really delved into the character's mindset. Their personalities were believable to me as individuals coming from traumatic childhood experiences. The lengthy episodes conveyed that and I'm not sure it would have worked otherwise. Each child grew up and manifested the horrors in different ways. The last episode was extremely long and it was a disappointing/overly sappy ending. I agree with the poster that stated that the house would not have been so nice, lol.
Oh, and the ghosts were a lovely (albeit creepy) cinematic backdrop. The character biographies could have been the result of any trauma: alcoholism, physical/emotional abuse, etc. It would have worked even without Hill House.

Have you seen Mr. Frost with Jeff Goldblum?

I have not even heard of that.

I saw it once years ago. From what I remember it was great. Not sure if would hold up but I’d watch it again.