Kubrick was a film maker's director, like Steely Dan is a musician's band. His passion was photography. His symmetry was always perfect. His vision was uncompromising. With Kubrick movies, one has to forget the common rules of script and pacing. It is about the total experience, not the plot or the actors. For instance, 2001 is considered by many critics (and me ;) to be the greatest film ever made, yet the plot is unfathomable, the acting is two dimensional and the pace has been known to drive some viewers insane. Charlton Heston walked out of the premier muttering.
But consider that over 30 years later, no film has come close to making the audience feel more like they are there, in space, experiencing the vast emptiness and loneliness of interplantary travel. This was done without the computer graphics we have today. That alone is amazing, and highlights Kubrick's attention to detail. Zero G toilets, entire sets that revolved to simulate the lack of gravity, meticulous modelling, and authentic console lighting, combined with soaring classical music to stun audiences with it's spectacle. It was more than a movie, it was a trip.