To call this a horror movie misses the point. It might be a vampire movie but not in the original sense of the word. To focus on the important things:
This is a wonderful movie. It is visually exceptional (partly because of the beautiful winter setting, partly because of the great camera work), it is well written, it has an intriguing soundtrack and some scenes really reached me.
The only things I found a bit dull were the visual effects (cats-scene and the fire) especially because until that point the movie tried so hard to avoid any scene that could actually visualize the supernatural nature of the film. These two scenes disturbed the experience, but it would be unfair to focus on them too much.
The vampire topic is just the film’s way of speaking about much more general themes like friendship, violence, relations to foreigners and loneliness. Its pictures will stick in your mind for some time I guess. A very original movie and one you should definitely see.