It went wrong as soon as they said critics choice. Critics don't view films in the same way as people who work the 9-5 and want to relax in the evening. Also box office takings is often the best marketed films. It should be a poll of the general public to get true ratings.
Requiem for a dream was one of the worst films I've ever seen. Might have had some good acting but its a film I'd prefer to have never seen.
Even the trailer is terrible and that's trying to get people to watch the film.
https://www.youtube.com/watch?v=jzk-lmU4KZ4
A real 100 greatest films would look nothing like that list.