A hero's nemesis is as integral to his identity as the clothing he wears -- and for that reason villains are our favorite characters to hate. After all, where would our favorite movie heroes be without their antagonists? Tilting at windmills, no doubt. That may have been fine for Don Quixote, but it just doesn't fly for Batman -- whose arch-nemesis happens to rank as one of the ten greatest of all time. Glare at his competitors.