system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] Why Citizen Kane is often regarded to be the best film of all time?

I hear this everywhere. Why is it?
gpt
Original storyline-- if many of the film's elements seem cliche, it's because Citizen Kane did it first, and everything else just was influenced by it.

Direction-- shots, editing, etc.

Pretty much, it set the standard (along with Casablanca).

Rosebud.