In the black butler manga's I have only read the first 3 books and i got to say there really good so far. I wanna carry of reading the rest of them as it gets quite addicting, its not the best book to read but its something where you can take your mind of thing and just pop into some else life. The plot of it all and the adventures are something to look out for as for the art and how the story line goes is very thrilling. There's is really nothing to dislike about it or love about it but it is one that youcan just enjoy and that's from my point of view.
I suggest if you want something nice and not to violent or too boring I suggest to read the manga's of black butler.