Go see it.
If you liked The Lion, the Witch, and the Wardrobe you will probably also like Prince Caspian. C. S. Lewis, being a WWI veteran, understood finely both the cost and the ultimate necessity of war among fallen men. In the Pevensie children, he gives voice to all views, disdain to none, and still keeps them as siblings who love one another.
Never once was I tempted to look at my watch. This tells me it was a good movie.