It is one of the best psy-films of all time.
https://slate.com/news-and-politics/2014/09/the-stalkers-ins...
Now Solaris book by Lem is far superior to Tarkovsky's rendition.
edit re: slowness, it's a lot less slow than his final few works which I also adore. they're all great I just think the rest of his catalog gets less good word simply for drastically less popular exposure.
I have never made it all the way through one without falling asleep. 2001, Blade Runner, Dr. Strangelove.... Even movies loosely associated with Kubrick like A.I. cause me to nod off. I have to stop when I'm nodding off and come back later fresh in order to finish.
Maybe it would be different if I had seen them in theaters.
Gladiator was also amazing!
There's still chances to see 2001 in cinemas! It gets re-released somewhat regularly for anniversaries and Kubrick retrospectives, etc. I was born long after 2001 came out, but I've seen it on cinema screens many times. It was so far ahead of it's time and looks so incredibly good in 70mm that it's mind boggling to consider that it was actually made in the 1960s!
I also like Tarkovsky's Mirror and The Sacrifice.
I still have not seen Mirror, though a few of my film friends have told me to check it out for years.
Out of curiosity, is there anything in particular about it you didn't like or was it a "just not my thing" kind of thing?
But I found the opening shot of the plants in the stream to be revelatory, a tiny bit of film making that changed the way I viewed life.