I've never seen the anime and I've never read the manga Kuroshitsuji. End of story.
I was thinking of what else I can watch this season while avoiding series that I'll most likely enjoy watching in marathon (e.g. Kakumeiki Valvrave, Suisei no Gargantia). I was eyeing on Mushibugyou because of… welll… the cast and it looks like it's going to be a long running shounen series so I might as well start early.