I have vivid memories of the first two Artemis Fowl books, but apparently none whatsoever for this one. Apparently I didn't reread it very often -- which is a shame, because it is an excellent instalment.
The characters really come into their own here, with great chemistry between all the cast -- plus, Juliet gets to play a bigger role, and she is so much fun. The writing style has really picked up too, and while the plot doesn't have quite as much going on as in previous books (that is, not every single character is involved in their own subplot that ties into the main plot), it does make for a smoother, more unified feeling. A maturer Artemis Fowl adventure, I guess.
My main issue with this book was how often it's brought up that Fowl is a genius. We know this from the first two books -- where it is telegraphed loudly, but there is some evidence to back it up. This book starts with Fowl being suckered in the most simple of ways, and his adversary, Spiro, just doesn't seem nearly as smart as, say, Foaly was in the first book or Opal in the second. So it was hard to believe that Spiro was so easily winning. And while the main thrust of Fowl's plan is not as disastrous as in other books, it just makes it all the more grating to hear, every few pages, that Fowl is a genius/his plan is to be trusted because he's so smart/but Artemis knows what he's doing because he always does.
Plus, we have ample evidence -- again, from the previous two books -- to know that Fowl has some huge blindspots. It would just be much better for Colfer to trust that we can see his genius, than to feel he needs to tell us that constantly.
The other issue, though this was much smaller, is that while taking Butler more or less out of the equation for the main heist raises the stakes considerably (he's an OP character even in a book chock full of them), I did really miss him. He's great fun, and is both literally and metaphorically a huge presence in the previous books, so his absence was very noticeable.
I suspect it is those two points that stopped me rereading this one quite so much, but this was definitely a very good entry into the series, and I'm glad I could read it with more-or-less fresh eyes!