The appallingly bad UI (particularly party movement - see the endless discussions of the BG3 "toilet chain" vs. BG1/2-style intuitive party selection/movement - but also inventory management), over-the-top cartoonish tone, claustrophobic/cramped map/game world design, and overall lack of immersion (no day/night cycle, ludicrously exploitable stealth "mechanics", etc.) make BG3 an extremely pale imitation of BG2 in my opinion. I'm sure I'll eventually play through it, but I'll be very (pleasantly) surprised if I find it to be anything other than slightly better than mediocre.
