I agree on the 4/5. I really liked the art and colors, but it did occasionally get too muddied, especially in the beginning. There was so much going on and the color palette was very similar. The story also involved a whole bunch of stuff that was occasionally hard to keep track of but all in all, I liked it. I can't wait for next month. Another review somewhere else said if you like Black Science and The Wake, you'll like this which I can definitely see is true.
Did no one read the comic? A lot of the comments on here sound like you haven't. This episode follows the ninth(? I think) chapter very closely. Of course, some stuff was added but this one was fairly good about following the original story. I personally was a little disappointed. I thought it was a little anti-climactic but then again, so was the ninth chapter. I'm just waiting for them to find Abraham (I like the actor I'm pretty sure it is).