Wasn't at all impressed with Divinity:Original Sin. Didn't like the mechanics of it at all. Played for a few hours and shelved it, never to return.
They would have to do something very different for me to give BG3 a shot.
Think I'm going to upset you twice here... BG:ToB was fairly crap imho. It took min/maxing to the extreme and felt like a fan-made mod. Never liked it. Also the difficulty was so extreme (due to the min/maxing) that I could only ever beat it by using one of the cheesing strats (many people found the final battle virtually impossible).
I think in general the quality of the writing took a turn for the worse in ToB, and the whole thing felt like a rushed/incomplete product to hastily wrap the series up. A shame.
BG2 is no doubt an undisputed classic of PC gaming, but...
For me, the original Baldur's Gate is the best. The freshness, the mystery and intrigue, the characters, the wonderful art and sound, the polish and the quality. Being gripped by the intro and first chapter, then dumped, without hand-holding of any kind, into the deep end, with no real idea of what to do. And what a journey it was. It was, for me, a first, like my first experience with MMOs (EverQuest). The game kept me interested, kept me wanting to see what was around the corner, what the next map would bring, what I would encounter next. Without being overwhelming, or massively power-gamey, or expecting experience/familiarity with D&D mechanics (I had none).
Whilst BG2 did iterate on and improve some aspects, BG1 really nailed it the first time around.
BG2 felt a bit "grim-dark" in comparison. No doubt quite intentionally. It had its own memorable moments, but looking back I think I preferred the simpler, happier times of BG1. And since it was my first CRPG I get a -5 save vs nostalgia against it.