@hawkeye10,
I'm not certain what you mean by dumbed down. I posted a thread about the death of children's author Brian Jacques. Now, his books were not the intellectual highlights of the 20th C., but the Redwall books were set in the High Middle Ages, a favorite historical period for children that invites the study of history.
Jacques, who was born in the 1930s, had a father who loved reading. The Jacques family admired Sir Arthur Conan Doyle, whose work is a favorite for kids from the fifth grade up; Edgar Rice Burroughs, who consciously imitated and responded to pulp fiction, and Robert Louis Stevenson. Doyle and Stevenson demand a solid ability to read and a significant vocabulary. I have no experience with Burroughs.
However, the common denominator in this list is adventure. During the 1960s, I read an interview with a symphony conductor (sorry, do not remember which one) who was asked if he allowed his own kids to listen to the then still controversial rock and roll. He said yes, because the aim is to get them to listen to music. They will move to more sophisticated music by listening and understanding music.
Well, time has proved that rock musicians are often among the most sophisticated but if kids start reading basic books, they will develop a reading habit. The answer is to do what my mother did: walk kids to the bookmobile/library. And to read them as I did.