I will take a shot at this

DD2 was a HIGH fantasy, cartoon like game. People in that game were cartoon and shallow. You started on a beach with a weapon doing 1-4, and 10 armor. And by the end your weapon was doing 1000 to 100,000 per hit and your armor was 8900.
I mean they just lost the scale and any sort of believability . It was common to walk around and talk to a painting or a broom even.

if the entire floor of the map was not ALWAYS on fire, or ICE or Electricity, you were not fighting. It was VERY hard to take that game serious. All the little details after that are irrelevant. Once you start flying 100 feet in the air , in your plus 5000 armor and shooting fire balls out of your bottom while the chicken god you are trying to save is telling jokes, well , it just turns into something else. I understand there is a market for that type of game, and many found it fun, but it does not really compare to BG3.

BG3 is a masterpiece. It puts you in a fantasy world were you can believe it is real, with real people you can relate to and understand, with detailed in depth stories, and even the combat, well finally d and d done right. I have not seen a game that is comparable to BG3 yet, with the STUNNING graphics and real world feeling, A quest you can do 5 different ways and each way alters your entire story, WHAT!? not once but all through out the game? And your comparing that to DD2?