The voices for the two main characters (Ciel and Sebastian) are portrayed terrifically and are true in tone to their Japanese voice counterparts (I saw season 2 in the subbed version). Some hardcore anime fans complain about the fake cockney accents, but they're mostly limited to some supporting characters. If you watch the dubbed version, the translation and acting are all excellent. There is quite a bit dark humor in different parts of the series, but it's balanced out by traditional anime slapstick comedy (which I'm actually not a fan of and part of the reason it didn't get 10 stars).

This isn't an anime with non-stop action, but it does have its share of dark supernatural battle scenes, as well as witty humorous battle scenes. Anyways, the series themes of revenge and redemption are woven together well with well-crafted story lines. It actually builds different stories to support different themes. This series doesn't have the lazy, shortcut type of writing that simply fills the plot gaps. Not that it was Oscar-worthy writing, but most of the writing I've seen in anime has always been the thing that prevented me from really loving it.

This may be the most well written anime series I've seen.

Black butler season 2 stream