I don't know why people hate this stuff. It seemed pretty enjoyable to me. Every moment was intense. I am the kind who don't depend on people's opinion. Rather than that I watch and justify that opinion. So, watch and decide whether it is good or bad TO YOU.
The animation is so good. The CGI of insects and all other details were really good. It was pretty good visual experience.
The characters were decent. I mean they were too cruel to be in this era. So it kinda filled artificial to me. The fucked author thinks everybody in the world is selfish and shit of character. It was a bummer. But they were no generic.
The story is good or fair perhaps. Because not much revealed in the movie. If you want story. Then follow the manga.
I enjoyed the movie. It was exciting. Not bored for a single moment. But too much selfishness and other sick mentality make the mood slightly bitter.
SPOILERS
There is no RAPE at least. So go give it a try. You won't regret if you watch anime to enjoy rather that criticizing.