It’s at 54% now on RT, and 53 on metacritic. The reviews on youtube are very similar in tone to the critic reviews. It’s looking to be a disaster. For reference TPM is at 53% on RT.
It was a ‘disaster’ back in February too:-
https://screenrant.com/star-wars-9-review-bombed-rotten-tomatoes/
IMDB also temporarily pulled the ratings for The Rise Of Skywalker earlier in the week when many people started posting reviews/ratings of the film - thousands of people, apparently… as they were all at the US Premiere.
I have no doubt there’ll be some people bashing it who simply haven’t yet seen TROS - or won’t be seeing it. Yet bash on it they will - with some considerable time and effort put into doing so - both repeatedly and vocally… (just in case anyone forgets they don’t like it 😉)
As for MetaCritic - at the time of writing this, MetaCritic says… 11 reviews are positive, 20 are mixed, 2 are negative: link
20th December Edit: RT’s ‘audience scores’ for TROS are at 86% (on 6,200+ odd ratings) - link