what's so great about the godfather?

[timoK]

ok so the godfather is like the highest ranked film at imdb.com and the AFI.

But WHY do people always say it's THE best film?

I have seen like a ton movies and the story is ok and MB acts real good.
But in my opinion ganster movies like Casino or Godfellas have a way better story and for example the action of Peter o Tool in Lawrence of arabia is way better than MB in the godfather.


So why do you think the godfather is a great movie?