As I recall, structurally, the novel is somewhat like The Grapes of Wrath, with expository sections interspersed with sections that directly advance the plot. I quite liked that about the Grapes of Wrath. I'm not sure if I take issue with the exposition/advancement ratio in Les Miserable, or if I feel less of a connection with the period Les Miserables is set in.
For children or not, I certainly won't hold The Princess Bride up as example of greatness. I would claim that the fact that it works as a send-up of a genre, including the alleged abridgement, is illustrative of something.
