My daughter and I went to see this movie in 2D last Saturday night. It was good, but I preferred the first Narnia movie. I bet most people will say the same. I do intend seeing the 3D version, and maybe that will change my opinion. The dragon and monster scenes were exciting, and in 3D, must look even more thrilling. I found the evil/good contrast very weak. I liked the bratty cousin who finds his courage and new attitude.
For me, The Voyage of the Dawn Treader gets 3/5 stars.