The movie was great, and the effects were good. The battle scenes were very "creative" compared to the book, but not making it way out there. They followed the book very well, and explained stuff well enough for non-book fans to understand.
The part I despised was the last minute of the movie, where Susan flings herself at Caspian for a goodbye, lovey-dovey kiss. I believe Disney was probably pressured into letting this kiss in by fans because of how "hot" Ben Barnes (Caspian) supposedly is.
The kiss ruined the movie because there was no kiss or romantic inference in the book.
But still a must see if you don't care.