The genre and special effects were so fresh back when it was released. I don't think it would work today, though.
Admittedly, I’m from the “Star Wars” generation, but “2001” is SUCH a bore. Kubrick did some good stuff, but I think he’s vastly overrated. “2001” felt like the ultimate in “Look how awesome I am” art-house nuttiness.
It wasn’t made to work like other narrative films work. It’s closer to music than cinema. Or some combination of the two. I’m guessing your kids haven’t seen many experimental or avant garde films?
2001 is one of the most over-hyped flicks of all time. And you're correct, it was super-slow. But this was a Kubrick film, so all the film critics and hoity-toity intellectuals climbed over each other to praise it. I saw it and lost concentration several times. However, the b word cannot be mentioned in many circles about a Kubrick film. But I don't care (nobody has ever invited me to Manhattan cocktail party...nor should they)...except for several sequences...the flick was BORRRRRRRRRING!!!!!!!!!!!!!!!