Out of all of Kubrick's films, I haven't seen Fear And Desire, Killer's Kiss, Spartacus and Eyes Wide Shut.
Kubrick...is and odd director to classify for me. He's certainly not a bad director, far from it. But, I cannot say that he's one of my favorite directors. His films are both human and un-human at the same time. All of his films have the scent of genius, yet I can't help but feel like there's something missing. If I had to guess what that element was, it would be relate-ability. Most of Kubrick's films, if not all of them, don't feel like they're happening on this earth. Like these films happen in an alternate reality, and this new earth learned everything it knows about humans by watching and observing us. I don't want to say they're aliens, but these people are not foreign or unknown, just...different, and not very relatable.
One of the things that I've realized about all of my favorite directors, is that they always some element of relate-ability in their films. Like I've seen these people before, or that I know the world that this takes place in. Filmmakers like Kurosawa, Hitchcock, Chaplin, Wilder and Hawks have something like that in almost all of their films (some more than others). I do not get that any Kubrick film I've seen. I can hardly relate to anything in these films, because the characters are so odd or the settings are just bizarre, to the point where all of Kubrick's films make me feel uneasy. Some people enjoy this about Kubrick, but I really can't get past it. Now, that uneasy feeling does not ruin any of his films by any stretch, but it does mean that I don't feel the need to rewatch the same Kubrick film for quite a long time. And that takes away a bit of the magic for me.
I guess my favorite Kubrick film at the moment is 2001: A Space Odyssey, followed closely by Dr. Strangelove and Full Metal Jacket. I don't particularly care for Paths Of Glory, The Killing or Lolita, but they're not bad films.