I think only one person said that because only two people have gotten to review it so far. She's some horror writer:
"Carbia takes things ever further, claiming “mother!” is bound to go down as “the most controversial film since “A Clockwork Orange.” “I can only say that it’s like nothing you’ve ever seen before,” she tweeted. “It pushes the envelope in ways you can’t even imagine.”
I didn’t really love it either. I was digging the first hour but the second hour just dragged and dragged with the same type of stuff. But the first chunk was so effective at putting you in her shoes, I really wanted to scream get the FUCK OUT to the intruding family. It was overwhelming at times
Then the decent into madness was..kinda fun at times, but overall didn’t really go anywhere meaningful for me. I’d like to read more about it though