One major thing I like about the Fighter class is its role-playing potential. Rangers, Paladins, Inquisitors, and Barbarians all have a limit to their backgrounds: Holy Warrior, Noble Savage, Woodsman, etc. but the Fighter does not. His background can be pretty much anything you want as long as he fights. I like that. I can be a grizzled vet, a scholar, a thug, or an ex-con. I am not limited by the basic background idea of the class. Sure, it's just a role-playing aspect of the class but it offer additional flavor to the Fighter character.