If you can get your kids to read these books then you are doing them a favor. These books are just plain fun but they also have many hidden treasures. The books have legends and history and ancient tales for them to read and maybe even remember. These are lessons that may creep up in school. These books have some fun mixed with knowledge. I cannot think of a better thing for a kid than to read for fun and accidentally learn something. The 30 Clues series is the same. Many historical and geographic facts mixed with a fun story.
I have read every Fowl book and I am an adult. My son read them until he was TOO OLD haha, and now my daughter reads them. All of us have enjoyed the books. Colfer has a whimsical way of blending fact, fiction, science fiction, and fantasy. He has a knack.
His stories some how always have a twist or two that keep me guessing and that is why I read his books. I am a continuous reader and can rip a story to shreds because of poor flow, grammer, or just plain poor plot. Colfer can keep me interested to the last word and I love it.
I am an adult. I am a Cardiac Anesthesiologist. I read constantly and I read Colfer.
Oh yes and the Time Paradox is a great adition to the Fowl collection.
I have enjoyed all of Rick Riordan's books. I pre-read for my children and have been amazed with his skills. I'm a very tough reader on a writer. I over examine style, prose, and story. I have loved his books.