I saw Narnia on opening day, having just recently read the books for the first time and was amazed at how close the movie was to the books. Unfortunately, there wasn't enough character development and no one who hadn't read the books knew who Digory was, and it would be kind of confusing to those that are not familiar with the story. However, that said, I loved the movie! Jadis was unbelievably good in it. Whe was just so evil, without being clothed in black and carrying a broom.
I thought the kids were perfectly cast, in fact, there was only one weak character in the whole movie IMO, and that was Aslan. He jsut wasn't enough. He needed to be larger and more majestic. Shame as most all the other characters were done very well. The CGI was done very well, loved the beavers and the wolves were just as evil as they needed to be. I did have to remind myself that this was a childrens story and not a long book, that they stuck close to the story so that we didn't get to know the history of it all. The Aslan dying, resurected scene was sure smacking of Christianity, but that didn't bother me really. Overall, it was a good movie and I will be buying the dvd when it comes out, but I won't be making multiple trips to the theater to see it.
As far as Kong whomping LOTR, no way! I expect to see a fabulous movie there, and expect that the theater will be getting more then one viewing of it from me, but I doubt if it will walk all over LOTR, but it should walk all over Narnia.