I've actually already seen the whole movie already. My wife is a blogger for Family Christian stores, so we watched it last week. You can read her review on her blog, or on Kirk Cameron's site. She interviewed Kirk first, then we were given access to the film online.
I found the movie interesting, even comical, but I was never really against Christmas celebrations in the first place. I did find his depiction of Saint Nicholas to be a bit violent, to an extreme really. I know that was what he wanted, as evidenced by his "Lord of the Rings" statement about it, but I still found it overkill (pun intended).