Godfather is the answer to everything. It's 42. Every character in the film portays a certain type of person: There those who are strong, those who are weak, those you can trust and those you cant. By watching, studying and understanding the way the characters interact you can apply what you learn to real life. You can label certain people in real life as Tom Hagen the trustworthy, Michael the wise, Fredo the idiot who eventually WILL backstab you, Connie the willing victim, Sonny the angry and unpredictable, Hyman Roth the untrustworthy businessman with potential to either make you rich or ruin you... etc etc etc.
Thats my take on it. I want to be a Michael or a Tom, but if I am honest with myself then I know I am a Fredo, and I now try everything I can to NOT be a Fredo.
I have a hard time holding a conversation with someone who says they couldnt stand or understand the Godfather or The Wire.
Part III was horribly paced/shot but the script may have had potential. They should have shot it more as if it was its own film.