Stan Lee, is an American comic book writer, editor, actor, producer, publisher, television personality, and the former president and chairman of Marvel Comics. (Lee, Stan; Mair, George (2002). Excelsior!: The Amazing Life of Stan Lee)
It makes sense. He's a narcissistic manwhore who has indirectly caused the deaths of thousands of people by allowing his technology fall into the hands of terrorists, and he tends to be a class-a jerk and yet he's still probably my favorite Avenger. You can't hate him. It's weird.