Story-wise, it actually has something to offer. The balance between Shinjuku's(if not Japan) dimensions between the humans and the spirits are threatened by a man who was formerly a Karas himself, it is now up to the new Karas to take this man down before he succeeds in destroying the balance of the two dimensions and take down his Mikura(in plural form) at the same time.
It also features a bit of a side-story about a Mikura named Nue who is after Eko as well. Altogether, I'd give this story an 8.
When it comes to Art, I'd have to give this a 9, the art is very well-done and the CGI isn't a mess, the art is so good i watched this show twice.
Sound(track), 10. It has a lot of epic OSTs, it makes me think that I'm watching some first-rate Hollywood movie, seeing that the Soundtrack is done by the Prague Orchestra, i can't expect anything less.
Overall, I'd give this an 8, very good characters and very enjoying, this title is going to hold you on your seat.
