in Godfather? Godfather Part 2? Part 3?

I would have to say that it is Pacino in parts 1 and 2. The change from college boy to mafia boss and the downfall that follows is amazing.

I'm not really sure about Part 3......maybe Andy Garcia as Vincent. My problem with Pacino in Part 3 was that he was a caricature of himself. In Godfather 1 and 2, Pacino's acting was so subtle, powerful, and perfect. In Godfather 3, he seemed more Big Boy Caprice (his role in Dick Tracy) than Michael Corleone. That's not saying his performance was awful by any means......it just wasn't anywhere near what it was in 1 and 2.