In my opinion, the worst thing you can do to the Classics is to foist them on children.
Children aren't mentally prepared to tackle the deeper issues that earned these books the title "classic." They don't get anything out of them- I certainly didn't. At best, a kid slogs through the book in order to memorize enough names and events in order to pass the test/write the paper, and then moves on. At worst, the child extrapolates the displeasure to be found in reading *this* book to *all* books.
I am a total bookworm. I always have been. I read probably 50 novels a year through middle and high school. I had a city library card before the school made us sign up for them. But required reading in grade school put me off of the Classics and nonfiction and any books with real substance until just recently, and I graduated from high school seven years ago. Even children's books were ruined for me, in some ways. I was first introduced to the Chronicles of Narnia hand in hand with a lecture about identifying symbolism in literature. We read the book as a class and pointed out every Christian symbol and motif to be found (and there are many). I was never able to enjoy those stories as just stories; to me, as a non-Christian, they are and have always been Christian propaganda. To my classmates who found those books before English 2, they are cherished childhood memories.
I recognize that there might be some deep and important message to take away from The Grapes of Wrath, All Quiet on the Western Front, or Lord of the Flies. But all I remember are stories so boring that my classmates prevailed upon the teacher: "If it's so boring that even she (me) won't read it, why do we have to?" I recall little to nothing of the events or characters of those books, but I do get a bitter taste in my mouth thinking about it.
Few people ever enjoy something they have been forced to read.