Villains are bad, it goes without saying. However, they can't be all bad for the simple reason that a character loaded down with all of the Seven Deadly Sins (along with whatever other character flaws writers can think of) will be too lazy, gluttonous, envious, prideful, angry, lusty and miserly to do much of anything. Where this can get strange and interesting is when this is applied to a villain who is Made of Evil. Here you have a ball of elemental nastiness who also happens to have one or more positive traits. Who knew elemental evil had such good taste in scones?