The fact that the special effects of a 57 year old movie hold up is certainly something. I find that people who are mostly used to watching more contemporary films (80s-present) are less likely to enjoy it. The pacing is slow and the tension takes a long time to build.

I've watched it several times and always enjoy it. The theme of AI gone wrong definitely was ahead of it's time. A lot of the tech imagined for it was also decades into the future, tablet computers, space stations, etc.

But you're not alone. Even upon it's release, a lot of critics shared your view, it was a polarizing film. It's a work of art, so it's value is subjective.