This was a book that I liked on my first reading, but loathed very certainly upon my second or third. The two-year gap might explain a bit. The two-star rating, instead of a one, is mainly because the stories included are very good. I find no flaws with them, and I've picked up the book to re-read them several times. But the trivia questions, extras, and basically everything else, are annoying and badly written.
It always seems to me that the major flaw of writers, particularly in the young-adult area, is that they try to force their own views down your throat. And Eoin Colfer has sadly fallen victim to this. It is said, repeatedly, that Artemis Fowl is the smartest living thing ever. Which leads to the problem that everything he says must be held up to the rigorous standards of being the smartest thing ever. Frankly, I wouldn't ever consider it a good idea to write about a character who is smarter than you are. You'd never be able to write that character properly, because you'd have no way of knowing his thought processes. And Eoin Colfer seems to think he is the smartest man alive, as he gives Artemis almost his exact political and scientific views. Every quiz and fill-out form only serves to show Artemis mentally atomizing some poor sap who dared to think the wrong thing.
I could probably ramble on far more here, but I'll keep it short. Though his characters are well conceptualized, they are handled very poorly in this book, and several further books as well. If you only want the short stories, pick it up somewhere cheap, but if you really want information on the characters and events of the story, it might just be better to Google it.