4. Aaron Eckhart
Aaron Eckhart doesn't have a great amount of huge films to his name. Before his fantastic performance as Harvey Dent in The Dark Knight, all I can think of with him in it is The Core - that film about Earth dying, the one with the big drill. It's a decent movie; you wouldn't switch it off if it was on TV. His career has picked up a bit since The Dark Knight; his most recent big hit was the wannabe Die Hard flick Olympus Has Fallen in which he plays the US President - very well may I add. It's not really fair to suggest that he will always be referred to as 'the two-face guy,' he still has a long career ahead of him and could still manage to become a familiar household name in the next ten years - it is unlikely though.