It was very disappointing. As you said, no answers to many of the questions. The show was very different from the book ending, as well. That may be part of the problem. The book ending was bad for other reasons.

I think the showrunners decided to leave us with all these questions to justify a season 2, which is lazy writing. I got halfway through and just wanted it to be over so there was some closure. I doubt I would watch season 2 if they renew it, but I also think it will get cancelled.

I got Lost or Twin Peaks vibes - the writers were more concerned with crazy twists and ideas and not concerned with payoff.