I suggest looking for the full context if you've got the time because seeing the quotes by themselves make it sound more depressing than it already does without seeing why (at least for me). You can found the context from the sources linked. Here are some examples.

First quote:

MAL article:

On modern life: "Everything is so thin and shallow and fake."

Source:

Miyazaki betrayed a profound dissatisfaction with modern life. He complained,

“Everything is so thin and shallow and fake.”

He lamented the fact that children had become disconnected from nature, and fulminated about the deadening impact of video games on the imagination. Only half in jest, he said that he was hoping for the day when “developers go bankrupt, Japan gets poorer, and wild grasses take over.”

Third quote:

MAL article:

On the entertainment industry: "In short, I think the work that we are doing is snatching away children's power."

Source:

"The environment that surrounds our children, including our animation, is all virtual," says Miyazaki, known for films like My Neighbor Totoro. "TV, video games, and then email, cell phones, manga.

In short, I think the work that we are doing is snatching away children's power."

This power he is referring to seems to be children's natural sense of wonder and creativity.