Trying to classify a movie as "best" can be done in so many different ways. And when film critics are the only factor taken into account for such a list, however, it's a given that the results may not reflect what's most popular.
With that said, Business Insider turned to the review aggregator Metacritic for its list of the all-time greatest movies, which ranks films by their composite critical reception. The list excludes rereleases and films with less than seven total reviews on the site, so numerous classics like The Godfather and Citizen Kane are absent for lack of data, and the data skews toward contemporary movies.
But it's an oddly fascinating assortment and most certainly up for debate.