Faber wrote an article in the Guardian about the adaptation, saying that he felt it really captured the spirit of the book. I agree.
The story takes many of the features of a conventional Victorian novel, such as the mad wife and the unloved child, and portrays them in a harshly critical light. Like Mad Men it criticises the invisible privilege and complacency of the powerful. Chris O'Dowd is very good - comedians often are when they turn to straight acting for some reason - his character is weak and selfish, but he can't see that, because his whole world is assembled to privilege his class. The perfect Victorian home he has created is a dungeon of horror, but nobody can see it or talk about it. I think perhaps the horror is more explicit in this TV version than it was diluted in an immense novel. It's not that he is evil in himself - he's just ordinary - but the huge inequalities of power in society generate evil from normality.