A Bigger Story!
As a Christian I am admittedly biased towards the Narnia films considering C.S. Lewis was one of the most well known Christian apologists of the 20th century, and fans of lewis will not be disappointed. There are many Biblical principles to be found throughout the movie such as the power of childlike faith, edmond's testimony, and obvious end times references.
In terms of entertainment value, you must see it! Prince Caspian has a much larger and far more engaging story than the Lion, the Witch, and the Wardrobe and the acting has improved drastically. I saw the midnight showing of this last night and loved every minute of it. If you enjoyed the Lion, the Witch, and the Wardrobe, you will REALLY enjoy Prince Caspian.
There are a few references to an adolescent relationship, though, if you follow the 'story line,' the character involved is technically an adult.