I'm not even talking about bugs. Opinion based on act1 and very beginning of act2 experience.
Dialog and player choices feel railroaded as heck, options are suddenly lovelove or rude as fuck. Quality of dialog writing is very different from other parts of the game.
His story is r/rpghorrorstory level problematic. From DM perspective his backstory and associate npc's are especially bad choices.
It wouldn't bother as much if either was better, but both in current state just sticks out to me.
My partner thinks this character must be some executives personal OP character shoe horned in to game despite criticism.
spoiler
sidenote: His story would work far better if he was delusional insane person. Instead its literal game over with "certain choices", if you take him out of the portal.
I quite disagree with the rpghorrorstory feeling. It's the opposite to me, even if I see why you may feel like this.
It's the opposite because the grandiose past comes with two bond that are completely in the hands of the dm, and because it is a video game, there is no bargaining around it : you have an anciant mortal curse that you need to feed in order to survive, and you have a past with a goddess, and we all know how the power dynamic is with a god or goddess.
On the one hand it is quite some for the dm to integrate, but on the other it's even more to work with than a paladin oath, a warlock patron or a cleric god. Narrative bonds are powerful tools for the dm.
As for the writing and the dialogue options, Gale is an asshole at first, that's not bad writing in itself. I guess it could be better, but I'm no writer and I'm not good with talking to people. I find it reasonably good. With some people you can only be blunt.
I think some people are out off balance by the direct flirty behaviour though. It's funny IMO because, although I'm not a woman, I feel like this might be what women live with some men. This is the case for several characters btw, and some articles about how horny the characters can be hint me into this line of thought.
At ttrpg, most dm's are adviced not to allow gale like backstory in to a table of normal low lvl characters, its very trouble prone and easily takes away fun and choice from others to make one character/player feel powerful.
Plenty of Discussion online, where dm asks other dms on the internet advice about this 15 yr old teen. Who has this character gale he wants to play. Its actually cursed lvl20 wizard, literal lover of gods and has friends who are lvl20, and worst of all. Can interact with these lvl20 friend characters at low lvl. Also has a lvl9 true ress scroll on him that the other players have to use on his character, if it dies too early or the world ends.
That's not gale that you're describing. You're describing an actual horror story that has absolutely nothing to do with gale, as I explain in my comment.
The resurrection, you don't need to give him btw, you're the dm. If you were honest you would also acknowledge that there is a character in BG3 that can sell true resurrection to you for 200gp.