I agree with the other replies.

I remember my first impression in watching GF1 and GF2 was my surprise at how understated and subtle the performances of Pacino and Brano were.

When I first watched the movies a few months ago, I didn't know what to expect. I had seen Scarface (1983) so maybe I was expecting to see some hot-headed guys.

But Pacino and Brando surprised me with their restraint. This is what makes GF1 and GF2 so powerful, because FFC lets the pot simmer but it almost never boils over (except when Pacino snaps at Kay in GF2 in the "abortion" talk, which is what makes this scene so dramatic).