I just don't get it. There are a lot of low level D&D games, examples of it are Dark Sun : Shattered Sands and Temple of Elemental Evil. But there is a huge difference between then to BG3. You don't start the game escaping a spelljammer mindflayer ship and enter in the underdark on chapter 1. It just makes no sense. Underdark in all D&D video games that I've played :
Dark Sun : Wake of the Ravager -> Entered into the underdark with everyone on my party above lv 13 and I was dual classing on 2e with most of my party members. Still had to reload a lot to defeat certain enemies. I was using half giants gladiators, fighter/preservers and everything that the game allowed me to use. Dark Sun is based on 2e which is consistent with the 2e modules like Night Below.
Neverwinter Nights 1 - Hordes of the underdark -> HotU starts at lv 15. And you only enter on the underdark on chapter 2, where you are near epic levels. There are dracoliches there, powerful vampire wizards capable of stopping the time, teleporting, conjuring hordes of elementals and putting nasty traps, mindflayer colonies and after it, you go literally to hell.
Dungeons & Dragons Online -> Menace of the Underdark expansion has quests from level ranging from 15 to 25. The wilderness of "the underdark" is a lv 22 area.
Baldur's Gate 2: Shadows of Amn -> Even as a mage, which starts at the lowest level, you start at lv 7 almost at 8 and only enter into the underdark on chapter 5. There, you see mages capable of casting high tier magic like stop time, see liches imprisoned, mindflayer colonies, drow cities can even fight a freaking demon lord, not mentioning pit lords and beholders.
I never saw Underdark being a low level adventure. In any computer game or P&P module. Underdark is medium/high/epic level. Underdark needs to be a terrifying place full of abominations, undeads, vampires, drow and people who are notorious heroes in the surface, becoming slaves from drow or mindlfayers there.
And how underdark is on BG3?
A place with some flowers and spiders and that is it. WORST underdark ever. Why have a high to epic level adventure on the story and a extremely low adventure in gameplay? If you wanna make a dungeons & kobolds campaign where you fight only goblins and kobolds, do that but let this terrifying places out of the game.
IMHO, D&D only starts to become interesting at lv 8+.
