Godfather and Godfather II are among my top ten movies of all time. They are morality plays, imho, and never grow old.
Think of the Bible and Shakespeare. Love, greed, hatred, revenge. Every human weakness. Love for family. I usually watch both once a year.
I put them in my top five, with Part II slightly ahead, mainly because of the old scenes. I think one could do a good essay: All you need to know about life, you can learn from the Godfather.
Agree - I think both are in the top ten ever produced, actually.
That being said, III is an abomination.