By the mechanics I wonder from you guys that are more Obsidian familiar. How do all the games (BG 1 2 3) compare to the lines of closeness, to the heart and gameplay of table top D&D
In both Larian and Bioware's, heavy adaptations were done to make the systems work with the videogame medium. Some highlights that I remember off the top of my head:
BG 1/2:
The 2E "group initiative" system is adapted to a RTwP system. Note, this actually works quite well unlike a 5E turn base conversion to RTwP would be like.
Changes to character creation - i.e. removed female stat restrictions from the corebook. Charisma hireling effects removed. Etc.
Changes to Class - added classes from 3E (i.e. Sorcerer, barbarian, etc). Added tons of kits (subclasses) to almost every class. Changed Illusionist (which was its own class) into a mage kit/subclass
Implemented the Weapons Specialization/Mastery system from the "Combat and Tactics" book. It was stronger in BG1, but nerfed to match the book in BG2
Epic level abilities (from Throne of Bhaal) are mostly a Bioware invention
Heavily re-balanced monsters ("hp bloat")*
Larian's BG3
Turn-based system implemented as-is in the game.
Changes to action/bonus action balancing - some PnP actions are now bonus actions (i.e. "disengage")
Backstab/High-ground advantage to attacks - "technically" in PnP (the book says DM should grant advantage whenever it makes sense), but still a big change from more PnP games
No new classes, but there have been some alteration and "rebalancing" (Rogues missing expertise, GOO Warlocks missing an ability) - could be bugs/unfinished
Rate and availability of treasure is higher in BG3. No attunement as of right now (which limits stacking magical items)
Larianisms like surface area damage (although that has been toned down)
Heavily re-balanced monsters ("hp bloat")*
* Yes, BG2 has "hp bloating" too - even more drastically than Larian considering the system they played in. It made sense though, because in these conversion, monsters are always more vulnerable positionally (i.e. no flight) - so HP is often increased to account for that. Some examples:
60 avg. hp Balors had up to 155 hp (the ritual demon in the Underdark)
33 avg. hp Trolls were had 80 hp.
102 avg. hp Great Wyrm Red Dragon had 184 in Firkragg.