It looks like it has an interesting plot, but it's not the kind of content I usually watch. 3D animation is not my favorite and I'm pretty sure I won't be watching it. However, it sounds to me like it has some good stuff based on what you describe and maybe, just maybe, I'll consider it at some point.
Very nice review.
I agree in some part with you, the use of 3d for an anime movie, maybe it is not the best creative decision, but it is still a movie with a plot that is worth watching