I remember reading that Larian hired some cinematography experts to add extra polish to the cutscenes - wish I could remember where I read that.
Well THAT didn't help.
Writing is great, acting is poor. Thats the problem though, teaching a 3D artist and programmer how a human body acts in a movie like situation. Even with motion capture. They over do it.
For the Witcher 3...I think the acting/cinematography is in general better than BG3, no overacting, movements are slower more natural (less is more). You can tell the animators got more and more experience from the previous Witcher games they made. BG3 looks better (Though I do not like the bright color pallet used).