I've seen just the first episode so far, but I thought it was pretty good.
The biggest negative for me is some of the acting, by some of the lead characters. Some performances are weak, and that's going to become a huge drag as the series goes on.
I felt the fight sequence in the early part of the episode was a bit silly - there was too much showboating and I think a more realistic fight would have worked much better and been more frightening too.
Other than that, I enjoyed it. Most of the actors give an excellent performance so that's great. I felt connected to most of them, and felt their fear - which is what you want really.
It's very beautiful and you can see where the money has been spent.
I'm looking forward to catching up with future episodes.