TBH it looks and especially feels much more like a reskinned Divine Divinity OS2 with DnD rules implanted than BG1 and BG2 (which isn't necessarily a bad thing of course, but I don't feel a lot of BG1 and BG2 nostalgia when playing BG3, instead I'm constantly reminded of OS2).
PS: One thing that is a lot better than in BG1 and BG2 is that combat with low-class characters feels a lot more interesting. Not sure how much of this is because of the ADnD vs DnD5 rules or whether Larian has added some tweaks to the DnD5 rules.