Yeah, I liked that the books were shorter earlier on, but some of the later ones I really wanted to be longer. (I particularly felt that way about the last two books, which felt short to me. I remember in an interview Colfer talking about the eighth book, and he said something like, 'The book could have easily been twice as long,' and I was thinking, 'You should have done it! I would have read it!' XD! Though I guess not every fan probably felt that way, lol.) Though by contrast, I felt like The Time Paradox (the sixth) was the perfect length.
Oh yes, I got them from our library first, then got them from Amazon later. So far, they've done the first four books. (Artemis Fowl, The Arctic Incident, The Eternity Code, and The Opal Deception. I keep looking to see if they're in progress working on The Lost Colony, but it doesn't look like it, so that might be all they do. :/) I do really enjoy the graphic novels, and it's just so nice to have professionally done artwork for the series, I find them fun just for that reason. (It seems like all the art was done by a two-person team, rather than a full team from what I can tell, which is pretty incredible.) I think the main drawback that fans complain about is that some of the designs don't match descriptions in the book. (Holly's skin is white rather than coffee colored, her uniform is kind of a white-and-purple color rather than green, Opal's hair is red rather than black, Foaly's skin is blue, and a few other things like that.) Also, if you're someone who reads a lot of Japanese manga like me, you might find the style a little jarring since it is a more western-style graphic novel, with quite a bit of narration. (Which manga doesn't use a whole lot of.)
But again, I just like having professionally-done graphic novels for the series, and there are some panels where the art is really spectacular. (Even if the interpretation is different from the book, it's interesting seeing different versions of the characters. And there are some decisions I can understand, like the decision not to give Holly a crew cut, or make the fairies 3 feet tall relative to Artemis. [In the graphic novel, Holly is the same height as Artemis.])
But, there is at least one fan-made comic done of a chapter of the series that is also spectacular, and I would say professional-level quality. (I'd link it to you, but I know you haven't read the later books yet. It's a scene of the first chapter of the seventh book, The Atlantis Complex, so when you get there, you'll have to remind me. It's unbelievably good, I'm still obsessed with it years later after I first saw it.)
“After all, absolutely no one can help but suspect a criminal, liar, and manipulator of committing crimes, lying, and manipulating. And of course, no one is more aware of that simple fact than Artemis Fowl.”
Opal sets into motion her most diabolical scheme yet, to frame Artemis and turn his closest friends against him. Only this time she has a new calculating partner who knows Artemis better than he knows himself. [An Artemis Fowl fanfiction, set after The Atlantic Complex.]
...Shameless self-advertising, guys! C;
(And if you're really bored: AF fanart. ;J)