You have to realize that "2001" was my generation's "Star Wars". I'll disagree with you, as it was one of my all time favorite theater experiences. But yes, it's not a popcorn movie, nor was it intended to be. It was one of the very first hard science fiction movies, that is science fiction written by someone who understands the science and technology that is intrinsic to the story. And it also was one of the first SERIOUS science fiction movies, in that it was made by one of the all-time great directors. To someone like me who loved science fiction, but hated that it was rarely treated with intelligence or respect outside of the written form, it was a milestone. That said, Interstellar was a colossal mess. I don't quite understand the high ratings. To me, it's the Nolan's worst film ever.