If you've never heard it, give it a listen. Several listens, preferably. It's a remarkable album. The majority of songs are sophisticated ruminations on the relationship between humanity and technology. It's easily the best pop/rock album of the last 20 years, and I personally put it in my top 10 rock albums ever made.
I was going to add my comments, but I think you've covered it. It's possible, given enough time to think about it, I might come up with another album as #1 (Mellon Collie by the Pumpkins?), but I am right there with your analysis of Ok Computer and have no problem w/its #1 status.