The music...
BG1 theme is one of a kind. It just makes you want to roll a new character and dive into the world. I've created many characters without even starting a playthrough just because of the MUSIC.
BG3 music is good but I wish it would be more inspired on the originals. The english lyrics "down by the river" seemed a bit odd at first coming suddenly out of nowhere on top of the instrumental. Love the unknown language in DAO theme for instance. English seems a bit mundane.
