Personally, I think it is actually quite good. Though the ending isn't as good as it could have been. I don't have much of an issue with the ending because it's point was to leave it open to the viewer. It is much like the big mystery at the end of Code Geass. For those of you who have seen that, you will know what I am talking about. All 'round, it was a good series and it may have the tag Yuri, but there is absolutely no Yuri in there, like at all, so sorry to disappoint all those Yuri fans