Comparing the ratings of the two games is completely irrelevant.
Solasta currently has 3,000 reviews and BG3 over 37,000.
However, let's ignore this fact.
Solasta having less reviews than BG3 doesn't mean that much. 3000 is still a pretty good sample size. In fact, even having only 500-1000 reviews would be fairly representative of the true population. So yes, let us ignore this irrelevant fact. Sample size links:
The mass of negative BG3 reviews (I recommend reading reviews on steam) was due to the fact that it is not a BG2 clone.
This is both an exaggeration and a strawman. Reading the most recent 100 negative reviews for BG3, maybe 1 or 2 of them are negative because it's not a BG2 clone. And that's reading their reviews in the worst light.
Most reviews are negative because of bugs, the fact that it's a full price EA game, high miss chances, too much DOS3 and not enough D&D (D&D, not BG1 or 2), bad pathfinding, too much micromanaging of party+items, the pace of combat, UI, controls, etc. Which are all (except for the whining about it being full price) are reasonable complaints.