Generally speaking, I don't think the quality of voice acting in anime productions has much to do with individual actors, whether new or veteran, but with voice direction. When I particularly like the voice acting in an anime, such as in Bungo Stray Dogs, Made in Abyss, Rakugo Shinjuu, or ReLIFE, there isn't really one particular voice actor who stands out above the rest but there's a general sense of quality of investment from all the actors. Usually such shows have strong use of music and sound effects as well. Thus I have come to the conclusion that anime having good voice acting really depends on how much the director cares about it more than anything else.
As an exception to the above, I will say that the worst, most lifeless voice acting I hear in anime is almost always some idol from AKB48 or wherever randomly cast in a role. In those situations, it seems clear that the person has been cast solely for cross-promotion purposes rather than because they are able to act.