None say the game is bad. The worst reviews still recognize its potential but recommend waiting for release.
GameSpot 6/10 "Reviewing Baldur's Gate 3 at this point in time is a delicate proposition. It shows a good deal of promise, yet there are plenty of warning signs it may not fulfill its potential.
Slight mischaracterization of all the reviews.
More seriously,
I think most people on this forum agree that this game has potential. The question is how much work/changes need to be done to become an amazing game.
I also think most people think that the game in its current state is enjoyable. But that doesn't mean it can't be improved, and it certainly doesn't mean we shouldn't point out any flaws and attempt to provide valuable feedback.
