We are all lost for words, that's all.
Tbh, I don't think it is that controversial. 2001 is certainly a divisive film. Many, many people don't like it, while the people who do like it tend to think it's incredible. There doesn't seem to be a lot of middle ground.
From your review it sounds like you had expectations, and that's why it was disappointing. Not surprising really when so many people have hailed it as one of the greatest films ever.
It's not like most films. It isn't character-focused; the characters are all important and represent plenty of meaningful things, but getting emotionally invested in them isn't what the film is about.
I don't want to sound pretentious but if you are looking for surface-level fun/enjoyment, 2001 will not provide.