Films that seize the moment when they were released and became a cultural phenomenon got way more praise than they ever deserved because they just looked so good, so strong and so important in the moment, but then eventually went up in smoke after we realized that they had pretty much nothing much to offer past their initial impression, films that have since either become punchline's of jokes or been next to forgotten by everyone who saw them.
But the power of the Masterpieces is that even if we don't notice their greatness the moment they are released, they still live on in the minds of those who saw them and will only grow stronger with time. Those films are the films that are harder to predict and only reveal themselves slowly throughout the years and decades after their release, and will eventually enter the hall of Cinematic Classics, of Legends.