Almost skipped this because of the bad reviews, but glad I didn't.
Initially I thought this was going to be a lot more gory, dark, and sci-fi'ey than it actually was. However, that wasn't really the case.
There's nothing deep about this anime. The story is nothing to write home about. And the characters aren't all that great or memorable.
Still, I found it to be an enjoyable watch.
There's a bit of something for everyone in this anime because it has romance, comedy, sci-fi, immaturity, gore, and nudity.
This anime is also short at 13 episodes; so it makes for a good show to watch in between longer running series that you may be watching.