I've read "American Psycho" by Bret Easton Ellis, and "A Clockwork Orange" by Anthony Burgess, so I am not unfamiliar with novels that contain a lot of violence or depravity, nor do I automatically dislike them. For that matter, I have read, and greatly enjoyed, several works by Chuck Palahniuk, who is also known for works that contain elements that are difficult to stomach as a reader. Despite all of this, I did not like "Kill Your Friends" by John Niven at all.
I think my problem with this novel is that all of the violence, in all of its forms, seems utterly unnecessary. Sure, it does move the plot line forward, since the only reason why the main character's life ends up as it does is because of specific violent acts he commits. However, the rest, especially the descriptions of his sexual preferences and conquests, his drug habits and messed up mindset, don't always seem to be necessary. It seems as if the author wanted to write something as awful as possible, just to see if he could get away with it. Yes, he did get away with it, but does it make the work any better? That's questionable.
"American Psycho" was written in a more elegant manner throughout, and while the violence is rampant throughout it, the way in which it is presented makes the novel more than just smut. It makes it difficult to read, but there are still elements of humor and intelligence mixed in throughout. "A Clockwork Orange," as anyone who has read it can probably attest, is difficult to read because of the violence, but also because of the language of the book. It took me multiple tries to get through the first chapter, and then, all of a sudden, I could speed through the rest of it. Despite the violence in the novel, and the language, it is still a popular book to this day, because of its social commentary, and because of, once again, its intelligence and observations of humanity. But "Kill Your Friends"? This just seems to be violence and gore for the sake of violence and gore.
Is this the worst book I've ever read? Definitely not. However, I don't feel like I got anything from it, other than a definite dislike of most of the characters in the novel. "Kill Your Friends" just seems pointless. Of course, if you're into things about violence and drug use and sexual violence etc., then this may be for you. But if you're looking for something that's more intelligent, yet still has some of the elements mentioned in the previous sentence, then there are many other novels out there that I would recommend before this one.