Pros: It's anime and has fantasy elements with some could-be-decent background story.
Meh: Characters are two-dimensional, it was obvious from the beginning who the fake was.
Con: Characters are ugly, fighting scenes make no sense, story is forced.
The basic story is a bad guy is coming, 6 good guys are chosen automatically and must show up at a certain point, but 7 people show up. After that the story is simply a poorly done whodunnit. After everything is figured out the season ends, so there is no real fight shown.
Conclusion: It's watchable, so if you're really bored it may be worth it. Otherwise, don't bother.