I also feel like the ending doesn't quite suit the tone of the game. I don't feel as strongly about it as OP, but the meme where 2 parts of a horse are in HD+++, and the head is of a stick figure comes to mind.
In of itself, the endings are acceptable. However, they miss a post action scene where the player talks to companions *and* a screen that explains the consequences of your actions. It's essentially one third complete. A one third complete ending is a 33%. That's a failing grade.
I've not even mentioned the extra companion content of a romance yet. It could be bumped down to 25% complete and I wouldn't oppose that judgement, at all.
While I believe in creative freedom and am not picky, I want to see SOMETHING.
Anything at all.
I can't imagine how disheartening it must be for people who romanced Astarion, see him scurry off into the darkness, and hear someone like Lae'Zel go: oh, well. That's the last the sun (and we) saw of him

I really, really hope Astarion has a secret ending where he's cured. And that Larian didn't butcher Karlach's

. SH seems as expected. So is Gale. Lae'Zel grew on me. If nothing else, you have to respect her unfaltering determination. I haven't looked into Wyll yet and probably don't want to be spoiled. Distrusting him seems like an important part of the experience (for myself)