I really enjoyed this movie. I found it better than Wardrobe because the characters and the setting have already been established. You get a little peak at what the Pevensies have been up to since their last Narnia trip, and then they are whisked back to Narnia.
All the actors are getting older and I think their acting chops are improving. Prince Caspian is also wonderful.
Having not read the book the only part that was a little confusing was understanding the existing relationship between the Narnians and the Tamarins, but I was able to get the gist of it. Lots of action and excitment. Over all great movie and I will see it again soon!