If you want to write about a person who isn't nice, people say, "This is a bad book. It's about somebody I couldn't stand." But that's not the point. You don't have to like a character to like a book. Most of the time, people would misjudge and say, "I didn't like the book." No, you didn't like the character. That doesn't make it any less interesting of a book. In fact, to me, it makes it more interesting.