If you're looking for a great laugh then this is it. I didn't expect this show to be so funny. I think part of my enjoyment had to do with the characters, Hoozuki especially. He's such a straight faced sadist who does some crazy things. The whole cast is very lovable. Just the way they interact with each other is hilarious.
Another thing that I liked were the jokes themselves. There are a lot of references that you get, that you don't have to be Japanese to understand them. There isn't much of a plot which is understandable. The show is basically the everyday life in hell and the people that live there. I like that though, because something new is always happening in each episode.
I also want to say that I enjoy anime that shows a lot of Japanese culture and history. There are many stories and real life people referenced that makes me want to research it. Not to mention the setting of the show has a traditional look to it. So all in all, I would try it out. I don't think it would disappoint.