Don't get me wrong, it's a really good movie - well acted, good pacing, interesting camera angles and choices of where to focus within the images of each scene, the story was unique and told in a unique way, etc. It's even a great movie, but I'm not so sure anymore that it is a true masterpiece, in the same league with movies like The Godfather, Seven Samurai, and Fight Club.
I think it was so uniquely jarring , so outside of what was considered appropriate content for mainstream film, for it's time, that it had a tendency to hit first time viewers as a revolutionary type of movie, and this almost certainly boosted it's appeal, among a certain, perhaps surprisingly large subset of the collective movie audience. I'm of the opinion now that it was so overwhelmingly unique in this one facet that it caused people to generally overlook its flaws when it came to critiquing this movie and rating it up against the classics.
Watching the movie again, after much time has passed since my first viewing, it still hits me as a very solid movie in about every way that one can critique a film, but there's just something that is missing for me when it comes to the complete experience of watching it, it just doesn't capture me in the way that some of the earlier classics did. While I can't put my finger on exactly what it is that it's missing, and whilst I can admit that this could all just boil down to my subjective opinion of what makes a great film, I can confidently say that it is no longer a top movie in my books.
It's still an "A movie" for me and well worth a re-watch every year or two, but it's no longer an "A+ movie". That title is reserved for the five to ten movies out there that still captivate me to the point of making me forget that I even exist, as they pull me into them for the entirety of their brilliant screenplay.