The Lion, the Witch, and the Wardrobe - Enjoyable, good for re-watches.
Prince Caspian - Slightly better than the first film imo.
The Voyage of the Dawn Treader - Didn't enjoy it much. Probably won't watch it again.
I read a couple of the Narnia books at school, back in the '70s.
I'm currently reading, and near the end of, The Prestige. I've already seen the film twice, and I re-watched it again yesterday. I think both the film and the book are very good. They also have major differences storyline-wise.