A bit of mystery with a supernatural feel, even if you can't quite be sure of that. Because sometimes I think of aliens, but that just might be me. The characters really pull you in as well. They kind of all have their own story, and we get glimpses of them throughout. It also has this quiet intense feeling about the show, and I enjoy every minute of it.
This show had great potential. An original plot, a great cast. But still it missed something. But what, I don't know. And now we will never know because the show is cancelled. I think it is a missed opportunity, but I understand the decision.
IMHO religious stuff + vampires + werewolves + devils representative etc do nothing for me. So far this series is interesting but the minute it goes fire and brimstone - I'll bin it! I cannot see where it can go!
FYI These days I watch the start only of James Bond movies as the endings are so predictable.