Why do people complain so much about CG usage in movies?

Before CG was possible, people complained that special effects sucked and said things like “I can’t wait until computers can give us better special effects” and now that it’s possible, people complain of too much CG usage. I feel like people are just nostalgic about old animatronics and guys in rubber suits. I agree that too much CG is a bad thing, but it gives movie makers more opportunities to show the audience their vision.