Wait so what is your complaint though? The OP failed to provide any concrete issue.
Is it that BG3 is a D&D based game, turn based, with faithfully implemented D&D systems, unlike real time BG1 or BG2 that were at best "D&D themed" in how they handled cast orders, spells, cantrips, controls and everything else?
Or is it that BG3 while incomplete has an incredible story telling, characters, replayability with multiple solutions and paths through most zones/encounters seen so far?
Because those are all upsides, not downsides.
Is this game a BG1/BG2 clone, with absolutely no changes to control scheme and systems? No. But it's not based on D&D Second Edition like BG1/2 were. And if anything it is WAY more faithful to 5E than either of those games were.
Is it different? Sure! Very! But the spirit is there.