Some complex movies have become so successful that they have been deemed ineligible for this list. Movies like The Tree of Life, Donnie Darko, Mulholland Drive, were excluded because they have a massive fanbase. While the movies on this list do have plenty of fans, the consensus seems to be that the complexity has driven people away.
Some movies failed to impress critics, some failed to impress casual moviegoers, and some couldn't make anyone happy. The point is, these movies have become misunderstood due to their complex nature