Dune
First time I watched this I gave it a 4/5 rating and now I've bumped it up to 4.5/5 and it wouldn't surprise me if it's a 5 on my next watch. As you understand more of the movie, it gets so much better.
The visuals are also amazing in the movie. I'm gonna rewatch it one more time before Dune: Part Two so then I'll see what I think about it then.