This was one of the better horror movies I've seen in a while.
The minor events leading up to the attack on the isolated Alaskan town were spooky, but the seige itself was almost as good as Night of the Living Dead. The movie does a great job of making you feel trapped along with the actors.
My only complaint was the vampires. They seemed a little one-dimensional. After two hours of watching them hiss and bare their teeth, they no longer seemed particularly scary.