I was really hopeful when I watched the first episode that it would turn out to be a good suspense/thriller based on the feel of it, but it really fell apart for me after that. The fanservice and harem-y elements began to be focused on to levels exceeding my tolerance while it slowly seemed to lose some of the dark plot that I was really hoping would develop well over the rest of the series.
And then I came to the ending which seemed totally crappy to me, ugh. Upon reading a review on ANN for the show and various people's comments about it, I learned that apparently they stuffed 37 chapters from the manga into just the last two episodes. Yeah. No wonder it felt rushed. x_x
So I'm unfortunately rather disappointed because it originally seemed to me that there could have been potential there.