A ten out of frikkin' ten, people. There's stuff in here, script-wise, that's so flawless, so nicely done, you only catch it on the second viewing. I watched with a bunch of other working screenwriters, and we spent the entire evening literally swearing at the screen as effortless little pieces of finely honed craftsmanship flew by.
Subtext. Genuine romance. Despair, effective horror, well-executed character arcs and some damn fine camerawork. Go see it now.