Larian Studios

The game really does need to fix a lot of its interactions. Enforcing simple rules from tabletop like only 1 levelled spell per turn would go a long way to address some of the more broken aspects of it. Implementing Haste correctly, because it is supposed to only give you +1 attack and you can't take the spellcasting action with it. Fix item and ability interactions that seem to boost dmg higher than it should. Shoving shouldn't be a separate bonus action, but instead be part of the attack action like throwing is.

Maybe give us a less useless option for humans, since there is no reason to play humans compared to half-elves on a mechanical level. The racial options don't have to be 100% balanced, but there should be mechanical reasons to want to play all of them and humans just don't have that because half-elves just do everything they do better.

On the other hand, the availability of magical items, the lack of attunement slots and the unrestricted use of spell scrolls are probably overall a good thing. Compared to Solasta, for example, martial characters feel much more worthwhile in BG3 and big part of that is definitely their access to magical stuff.

It feels like they designed BG3 with Divinity: Original Sin 2 as a reference. That has positive and negative sides. One of the negative sides that is really shining through is that in the DOS games, every character is a spellcaster in one way or another, because martial abilities are themselves treated as spells. That 5e doesn't treat its martial characters like that has long been a problem in tabletop and it is still a problem in BG3, even with the added weapon maneuvers tied to weapon proficiency.

In tabletop, most martial characters (outside of some very specific and synergistic multiclass combinations that usually rely on spells from half-casters and fullcasters anyway) feel underwhelming while spellcasters who does the bare minimum to optimize can very easily become overpowered. Some spellcasters, like Druids or Wizards, can even accident themselves into being OP by just preparing the right spells (like Conjure Animal). In BG3, most martials feel like they can quickly push towards being overpowered, while spellcasters just breaks the game.