I saw Voyage of the Dawn Treader a couple nights ago.
Overall I was underwhelmed. It was OK. Better than Caspian, but not as good as Wardrobe.
Eustace was casted perfectly- both as a boy and a dragon. I found Lucy's infatuation with being as beautiful as Susan to be overdone. Caspian was pretty flat as a character. The movie moved swiftly, to the point of not providing enough background information about several characters and places (Coriakin, to name one character only slightly explained as well as various intriguing islands that are given almost no explanation). The main story line was kept intact, however they failed to include some of Reepicheep's most profound lines as he readied to sail toward Aslan's Country. Reep was better in this movie than the previous one, but only slightly. They didn't shy away from Aslan's clear reference to Christ as he said goodbye to Edmund and Lucy, for which I am grateful.