Yeah, auntie Ethel is a highlight - and tehre isn't really a happy end there. Most of her victims are traumatized, you can't really bring Mayrinas husband back as anything else than a walking corpse and there is the prospect of facing Ethels sisters in the future (at least the one in Baldurs Gate, I guess). The teahouse has one of the best dungeons so far in the game. And yes, love the Underdark, so beautiful and yet so deadly.
I hope, we will see the Tieflings again in Baldurs Gate. I'm pretty sure, Mol is our introduction into the thieves guild and we might meet Alfira singing in one of the taverns.
"We are all stories in the end. Just make it a good one."