i agree, without al the godfather would be nothing. like his performance is soo amazing. although the films are beautiful on their own, if somebody else played micheal i dont think i would have cared about the character. he makes you think this is a real person. eventhough he is involved in mafia, you know hes trying to get out.

Michael Corleone: My father made him an offer he couldn't refuse.
Kay Adams: What was that?
Michael Corleone: Luca Brasi, held a gun to his head, and my father assured him, that either his brain or his signature would be on the contract.