I beg to differ. The NARNIA books are some of my favorite fantasy books of all time, and I personally loved THE LION, THE WITCH AND THE WARDROBE (2005). If anything, I felt it recaptured the essence of Lewis' book to a tee and beyond. The children were perfectly cast, the animals were spot-on, and the script had a solid balance between staying true to the material and adding in only when necessary. It's the best of the three movies IMO.
I mostly liked PRINCE CASPIAN, but the book was obviously much more challenging to adapt. The Telmarines' Spanish accents didn't bother me that much, but the castle raid scene was a bit too long. I liked it overall, but it was obvious that they took liberties and omitted parts from the novel in places.
As for THE VOYAGE OF THE DAWN TREADER, I seriously don't understand what critics are thinking when they say that this movie is unbearable. I consider myself a very good judge of what is good moviemaking and what isn't (The LORD OF THE RINGS and HARRY POTTER and the classic STAR WARS trilogy are always top grail quality, although the prequels to the latter are pretty iffy -- ROTS not so much, though) but I personally enjoyed every minute of VODT. Yes, it doesn't follow the book 100%. But unlike CASPIAN, I felt it captured the general ideas that the book introduced, and while I was a bit unsure about the green mist/seven swords subplot at first, I ended up approving of it. I don't think it's a perfect movie by any means; there are times when the film feels rushed (an extra 30 minutes wouldn't have hurt) and there was one scene I really liked from the book that sadly didn't make it into the picture, but on the whole I really liked the film a lot. I'd say it's somewhere between the two.
Not that I don't like the BBC TV versions or the Radio dramas; they're all great entertainments -- Lewis' tales are imperishable either way, but as far as visceral experience is concerned, the Walden Media movies definitely win out. True, they may seem LOTR-ish in places, but Lewis and Tolkien are two different fantasy storytellers, and neither is better or worse than the other. I like both equally.