Black Isle:
Baldur's Gate - liked it at first, but got tired of it by the end. This is my first game by the dev.
Fallout 2 - liked it a lot. Tried a second playthrough with a Jinxed/pariah dog build, didn't work out that well.
Planescape: Torment - loved the story, but the beginning part was a pain to get through. At the end farmed the Glaabrezu in the sewers for items for too long and became too overpowered. Just to see if I could, beat final boss to death with TNO's own severred arm from previous life.
Icewind Dale - played it, beat it, don't remember much except I didn't really care for it.
Baldur's Gate II: Shadows of Amn - Liked it a lot, but put it on hold at the end of act 3 or 4 or something. Started another playthrough with a solo Sorcerer with some hacked items (specifically the boots of haste to have actual Haste effect instead of just fast movement, and throwing weapons including that returning dart to have +STR bonus like they should) but put that one on hold at some point as well. Dunno where those saves are by now, if I ever play again it'll be from the beginning.
Troika:
Temple of Elemental Evil - liked it. Did one normal playthrough and one as a solo Level 2 Thief. Kinda a short game tho, ain't it. Never tried the mods.
That's is the only one of the dev's games I've really played. I did try Arcanum for maybe 10 minutes and Bloodlines for an hour or two. Will almost certainly play Bloodlines for real, only didn't keep playing it back then was because it wasn't performing well on my system.
Obsidian:
Fallout: New Vegas - played for over 100 hours in 2015, burned out in the middle of the 3rd DLC. Need to get back to it sometime, but it'll be hard trying to remember all the mechanics and stuff.
Neverwinter Nights 2 - started my first playthrough last year, put on hold after about 20 hours when got confused by crafting skills/requirements/etc.