RIP. The "Godfather" has become a real part of our culture, a book like "Gone with the Wind" was to an earlier generation, and a film like "Casablanca" that everyone has seen and remembers.
The "Godfather" series is not a part of American culture. Maybe the east coast where for some reason the mob is revered but the rest of the U.S.
I have only seen the first one. After that the rest could only be as boring as the first so I never watched.