It is tough to make an argument that this is not the greatest movie of all time. Great cast, great directing, groundbreaking camera work, good plot buuuttt I still don't think its the greatest of all time. Casablanca and Godfather 2 rate above it and here is why.
First, rewatchablility. Casablanca and GF2, I will watch at anytime, day or night. Kane, I would watch if a friend has not seen it.
Second, the plot. It leaves me hanging. The audience gets resolution but I feel empty because the other characters do not get it. Plus, parts of it are a little bland and I didn't particularly like Kane's second wife.
Next up, "One Flew Over the Cockoo's Nest"
What can I say, it swept everything in 1976, I believe. Best picture, best actor and actress and director and original story.
Jack Nicholson develops the character he uses in at least 80% of the rest of his movies. A badass who may be the only one with a sense in his head but everyone else is so crazy that they think he is the crazy one.
Hilarious movie. This is a movie I would consider buying.
Last but not least, "The Blues Brothers"
The only thing you need to know about this movie-"We're on a mission from Gawd"