I'm usually the resident CG defender around here, but 1SO's argument is assuming the CG characters were in the ballpark of convincing which in my experience they were emphatically not. Obviously different people have had different experiences though (IMO Tarkin was far less convincing than the Leia shot, though overall screentime certainly plays a part there.)
The slight is not against the CG itself, which is still incredibly impressive work, it's against the people who made the decision to feature the hardest possible thing to do in CG in such an unabashedly in-your-face way.