I've only watched the first episode so far, and I was concerned that the series would make the same mistake as the book and go for a second-order counterfactual. I'm reassured to know that it actually ends on a more ambiguous note.
John Turturro's performance is impressive; a lesser actor would have made such a character merely hateable, but he brings out the tragic poignancy of someone who gets tricked into betraying everything he cares for, and ultimately himself.