(discluding Godfather III)...
If you think the Godfather parts I and II are boring, then you are not someone that understanRAB the medium of film. You are clearly a person that sees film as a commercial entertainment and not an art, which it is.
I get enjoyment watching films from the acting, plot, writing, direction, originality etc... Can't you see the brilliance of Brando, Pacino, DeNiro, Cazale, Caan, Duvall and Diane Keaton in Godfather I and II? Or the magnificence of Coppola's directing? If not, then you've got to get some basic education about films.