Knew very little about the title before watching it so didn't have much expectations. But it was a pretty interesting first 5 episodes. The story is a good mix of supernatural horror, in the form of demons and zombies, and action. Although there are elements that you've probably seen in other animes this one still manages to keep your attention. Due to its content I wouldn't recommend this for younger viewers. Also the main character's sister has a strange concern/infatuation with him which maybe weird at times but don't let that turn you down from the rest of the series. Lets see how it develops....
I was first introduced to this series via the SiFi Channel. What I have seen so far it is a good series, and unlike the one review I think the anime quality is pretty good. It's not Final Fantasy: Advent Children or anything, but it's still good. I would recommend this series to any serious anime fan.