Then again, it just might be that there are some great lines found in those movies that are completely relevant to today. One that always comes to mind can be found in context to the Fellay-Krah machinations or to the whole ecuмenical outreach thing. From The Godfather Part II:
Frank Pentangeli: "Your father did business with Hyman Roth. Your father respected Hyman Roth, but your father never trusted Hyman Roth."
There are others.
"I can handle things, I'm smart, not like everybody says. Not dumb, I'm smart, and I want respect!"
"Discontent for money is just a trick of the rich to keep the poor without it."
"You give your loyalty to a Jew over your own blood."