I won a copy of this movie in a competition. It was absolutely stunning visually; beautiful animation that consistently made me gasp. Nice world-building and interesting characters too. Sadly, the plot let it down. The story made little sense, moved too quickly and breezed by several gaping plot holes and conveniences without seeming to notice. Not enough to engage the heart and/or brain as well as the eyeballs, I'm afraid. Although I will say that 3, 4 and 6 were adorable.
Worth a watch for the amazing visuals and endearing characters. Just don't expect a gripping story.