Nothing against the skills of the voice actors, but voice acting does not often translate to a film/TV event. I have been doing professional voice work for many years and can tell you I am great behind a mic but in front of a camera not so much

You're probably right, but I heard that the voice actor for General (Admiral?) Thrawn is killing it in the live action role in Star Wars (I'm not watching it though because I have 0 interest in anything made by Disney).
I hope if it is a BG3 series that the game cast are at least given consideration in the audition process. Idk how it works I have never worked in the media industry.