This anime isn't for everyone and I can say it is one of the slowest starters ive ever seen. There is no real story line until much later on and this can seriously put watchers off. There is a lot of mindless gore which kind of makes it unique but it doesn't really get into it until around the last few episodes.
Character-3: There is literally no background to any character, no depth or explanation, even saya is hardly explained, why is she what she is (without giving away any spoilers).
Art-8: However this anime is beautifully created, the detail and texture of the surroundings is beautiful and you can see the detailed water painting in some scenes, the fight sequences are also very well animated which is one of the few good points about it.
Sound-8: The music played, is literally amazing, the orchestrated pieces suited each scene perfectly and added an effect that you rarely get in anime, but was slightly let down as it was overused quite a bit.
Overall Im giving it a generous 7 as the last few episodes picked it up and scraped together such a poor start and also because I loved the art work, though I can see why people gave it a rating of less than 5.