Starts of familiar enough then gets quite interesting. If you enjoy slightly typical fight/action anime then this is for you. It does have a few things that keep it from being a carbon copy. Plagued with filler. I personally don't really mind this, but it does detract from the point and direction of the story.
O.K., good fight sequences. This is important considereing it is a fighting anime. The range of different abilities on show isimpressive and at no stage do you notice any flaws in the fight scenes. This is impressive because there are lots.
The music is very good throughout with some excellent themes. It adds tension to the action sequences and it is here that the music really shines. There is a good vocal cast performing well. It is hard to separate the voices from the characters and they really help to fill them out.
There is a wide and diverse range of characters, who are all likeable and have good development. Due to the large cast you do wish that some characters would get more screen time but that is testament to how well they are created.
Good fun, avoid the filler. If action/fighting anime is your thing then you must watch this. Otherwise it is probably only ok.