Prince of Thorns
The Broken Empire #1
Complete and utter over the top brutality and selfishness. The main character simply does things to spite others. While you might have felt sympathy for him because of the horrible history he had, he uses that history to grow his hate and rage to commit as great, or even greater atrocities, thus becoming a ravening beast inspiring hatred and rage in others, and thus continuing an ever-downward spiral.
I will not be reading any more by this author.