Books where you find yourself liking the antagonist? (teenage fiction)?

I'm just wondering if there are any books out there where you find yourself liking the character of the antagonist. I've read the Gone series by Michael Grant and I found myself liking Caine Soren's side better than Sam Temple's. Also, in Harry Potter, sometimes I found myself liking the death eaters and people like Malfoy and Bellatrix Lestrange, purely because of their characters. In a series of unfortunate events I thought that Count Olaf was a good character in a strange villainy sort of way. But most of the time, I don't like the antagonists, so I was just wondering if you know any books where you like them. Whether it's because of they have character or because you start to feel sorry for them or any other reason you want to mention. Teenage fiction is preferred as I am 14 years old (oh, and I don't like dark romance and vampires and things like twilight, but you're welcome to put them on here if you like the antagonist.)