...Well, consider:
1. I assume you've watched the film only once.
2. You haven't seen the other two films, which play a role in appreciating 2046.
3. You had expectations of a science fiction film, so you weren't getting exactly what you expected.
...
All three points are correct! I saw this at a dinner party about 10 years ago. A friend who was notoriously secretive, so secretive that none of us knew where he lived suggested that we have a picnic. I was in the car following his car. He stopped by a park, and got out, telling us to wait right there, and walked into the park. We were mystified. He drove off, and we wondered just what the hell was going on. Ten minutes later he came running out of the park, hopped in the car, and said," Drive."
He guided us to a nondescript bungalow on the other side of the park and said, "Let's have the picnic here. In my house." We were flummoxed. So we had the picnic in his living room, and watched a bootleg copy of the as yet unreleased 2046. I really enjoyed it, but maybe it wasn't exactly the movie that was so enjoyable!