The story, which I wouldn't even call it, was terrible. The concept is interesting, but the story goes no where. When I first started watching the anime I enjoyed it quite a bit. However, I was expecting them to go into Hell and go on some crazy adventure. None of that happened. It was just the main character, Tatsumi Oga, taking care of a demon baby and going to his delinquent school.
The art was standard anime art and there isn't much to say about it.
The openings and endings were alright but nothing to special. The background music in the anime was dreadful and I despised it. It was the same music over and over again. I sometimes hear Beelzebub's background music in my nightmares.
The characters were poor. Oga was kinda funny but a stereotypical oblivious delinquent. Hildegard was probably my favorite character out of the whole series, but she still wasn't great.
I didn't enjoy this anime except for about 5 episodes. Other than that I hated every other episode.
Overall, this anime was poor and I did not like it at all. I don't recommend this anime to anyone unless you want to waste your time.
