Lately I've re-read some of the old classics I enjoyed when I was a child myself. Most of those wouldn't have a chance of getting published today. They don't start in the middle of the action and include far too much description. In some of them the main characters don't even have a strong goal.
Modern kids are so accustomed to the fast pace of TV and electronic entertainment that many of them wouldn't have the patience to read some of the old faithful books, but those still have the ability to carry the readers into a different world.