Leave the classic trilogy alone, the are perfection. Any complaints or nitpicks we have now are entirely the result of the failures/disappointments of the new trilogy which I still loved BTW, but not as much as the old ones.
I must be out of touch, I haven't seen any Kubrick movies other than the Shining, saw it when I was very little, scared the crap out of me wouldn't/couldn't watch it again. I might still try someday. I never seen A.I so I am not sure what all the fuss is about.
Spielberg is hit and miss, I like a lot of his newer stuff, but am the only person on earth who hated E.T. Weird part is as much as I hated the movie, I actually liked the video game. Yeah I know I ain't right.