Definitely a whole lot of dark elements, (r*pe, dismemberment, murder, self harm, sexual and domestic abuse) might not be the best for everyone.
It's executed brilliantly, if you ask me; I love the way that all the characters balance each other out perfectly and that despite the fact that the story flows really well, suspending tension masterfully, it's never too obvious which way the tides will turn. The dark themes are also complimented by the colourful cast and unpredictability, although a surface-level read-though might make it feel a bit underwhelming.
Personally, I think that this is a masterpiece. Really disappointed to see only negative comments, which I staunchly disagree with. Then again, like I said it's not for everyone, I suppose.