Also, I'm a huge fan of Warren Ellis. I was pleasantly surprised to see his name on the writing credits. Knowing how he likes to tell longer, involved stories with big reveals, I'm thinking things will get really surprising later on.
The first part of the series is a short four episodes, but I'll take quality over quantity any day! The animation is gorgeous and the voice acting is subdued. It reminded me a lot of the tone of the Vampire Hunter D movies. And there's nothing wrong with that! If it works, no need to fix it. And it most certainly works here as well.
(P.S. The IMDB reviews by whining Christians is too hilarious. Check those out if you want a good laugh of people bellyaching because of all the anti-Christian themes in a gothic vampire story taking place in the "Dark Ages." LOL)