No expression at all sounds better.
These facial expressions betray how the PC reacts to things. And those reactions are very tied to personality. Which, for a Custom PC, should be player-defined. Maybe I'll want to be play a green city-dweller who's afraid or disgusted of every other new thing met. Maybe I'll be a hardened Outlander who's seen a thing or two. Larian can't cater to all PCs, so it's better to simply not show reactions. Let players imagine how their character would react. The camera could stay focused on the person speaking or the thing happening.
There was a discussion somewhere (OP was Dotsmat, I think, can't remember title), that convinced me that, in Larian's vision, the expected way to play is the play an Origin Character. These generic/vague facial reactions are probably placeholders, to be replaced by the actual, relevant reactions for the Origin Characters.
But I hope they then let the Custom Characters be custom.
100% this. I cringe every time they try to show my character reacting to something. If this were a tabletop game and my DM told me how my character reacted to every conversation (outside of information that I genuinely don't know, but my character would), I would pack up my things and leave (well, I'd probably have a conversation with the DM first, but you get the idea).
