I really wish we could give half-stars on Goodreads, I've been noticing that for several books I read lately... 
 Anyway, i'll give 3,5 to Anna Dressed in Blood, because I really liked the story but once again, I fell a little cheated by the way the characters quickly become friends. Maybe I'm just becoming touchy touchy on this subject but it seemed very fast to me, mainly the reactions of their few days together. 
 Weirdly, on the Cas and Anna relationship, the fact that it was also fast didn't bothered me that much. Is it because Anna is a ghost? Maybe... 
 I'll definitively read what's next because at the end, the characters are good, I liked them. Also I don't read much ghosts stories but it without doubt took me bzck to Supernatural. The main character is a hunter, and he's called Cas. I was sold before starting, really.