First, I like the idea of body snatcher monsters and it was executed very effective in this movie.
The characters, tension building, subtle effects, it all works here... but... what on Earth happened with camera?!
Such a good movie completely ruined by what I can only call amateurish shaky blurry camera work. It's not only irritating, as the story/writing is actually engaging, but also quite uncomfortable to watch. Why oh why, you had it and you blew it completely!