Most Pretentious Film of all Time? It's gotta be close.
I don't usually mind art films, but this film is the epitome of pretentiousness. None of the imagery or symbolism is particularly interesting or telling. None of the characters matter, there's literally no plot at all, and the score is a grinding snooze-fest. I don't doubt the director had something interesting in mind when he was shooting this, but it seems he was trying way too hard to make something oh-so-brilliant that it turns out to ring as hollow as the tin man's chest.
But that's giving them the benefit of the doubt. Perhaps the whole crew was on acid from start to finish. That probably makes the most sense.