One of my old pals taught me this trick post-Gigli... imagine every/any individual role in cinema initially as the original actor, then as Ben Affleck. It's amazing... what's even more amazing is that he's even worse than himself in his own roles. If you can get your head around that. Intriguing.
The easiest one might be: Michael J. Fox as Marty McFly. Then try and imagine that role as acted by Ben Affleck. Have fun!