What makes a movie truly great in my personal opinion is the cinematography. All great films, like Citizen Kane and God Father stand the test of time, but what is mainly studied in these films is primarily the cinematography. Film is a unique art form because it is visual interaction.
I have personally DPed over 25 films. I have a lot of experience as a Gaffer as well as being a part of the G&E crew. I also have experience with being the 1st and 2nd AC.
Camera: Canon 60D
Lens: 50mm f/1.8 and 24-70mm f/2.8
Audio: Rode shotgun microphone