I saw it the day after it came out just to give it a shot. Wasn't really expecting that much, just crazy visuals. I was pleasantly surprised. The movie is fun as hell, and after I told my wife I liked it she wanted to see it (she hadn't wanted to before). She ended up reallying liking it as well. Definitely will be picking up the Blu-Ray. As long as you don't go looking for anything too serious and just go with the flow of it being over the top you should have a great time.
And today I was again pleasantly surprised by Prince Caspian. The first movie was so drab and dull with horrible acting and just no emotional weight at all. Everything in Prince Caspian was WAY better than Lion the Witch and the Wardrobe. Acting was better, action scenes were tons better, the score was much better and darker. The tone and pacing were much better, it was darker and there seemed to be a greater sense of urgency. Just an all around much better movie than I was expecting.