My main worries is about combats.
Combats are fun in BG3 but for a few hours. I'm sure I'll get bore before the end of the game (I already get bored before the end of the EA).
Maybe it's cool in MP because you're playing with friends... But in solo combats are very limited, pre-determined by few mechanics and you have to use the same tactics over and over again.
Honestly, MP combats sound even worse. Like, rn I have 4 turns per round, and waiting for each enemy is already tedious.
In MP, I'll only get 1-2 turns per round, and I'll also have to wait for my friends to make decisions about their actions... It will likely be more fun because of the company, but combats will take soooo long.
Just depends on the players, you'll get time in-between turns to plan ahead what you want to do for your turn. So generally people that prep will make the game go faster, unless you have a friend that takes 2 minutes deciding on one ability/action...but then you also have community members that want to stretch out combat for reaction abilities, so you get pop ups in the middle of the screen for those. super great like real great.
Anyway, my main worry would be story related. More extreme cringe moments, off the top of my head at the end party, the evil druid shows up in the corner for no reason other than to have the couple get justice for what happened to their kid. Who would invite this lady to the party or why would she ever EVER show up to this party, it's a completely stupid scenario.
The other part would be in DOS2 custom characters felt lifeless or less important than the premade characters. It has been about 2-3 years since I touched that game but I do generally remember getting that over all feeling between the two.