I think it’s time to put away the tinfoil hats and doubt anyone does “review bombs” or whatever they are called. Studios are in a constant battle to win the PR war and they do everything they can to mitigate bad publicity about their movies. If the critics give bad reviews, then there are suddenly news stories about how Rotten Tomatoes is not reliable and hurting the movie industry. If fans give bad reviews, then suddenly its bots and trolls making the score look bad.
I can say that when I watched in a packed theater on opening night, I didn’t hear any cheering or excitement. During the Canto Bight animal sequence, when they were running through the casino, about half a dozen people got up and walked out. Probably just to use the bathroom or get popcorn, but still nobody liked that entire portion of the movie. On a couple of other non-Star Wars forums I visit, almost everyone dislikes the movie. Couple of positive reviews here and there but mostly nobody liked it. On Star Wars forums it’s a mixed bag. Some people like it some people hate it. Just my experience.