Yeah the main question that I had about this movie was that if you knew that your life was that of a donor and you were trying to extend that life, wouldn't you just run away? The plot had a few parts that showed how some of these peeps wanted to be with one another and not die for a few more years, but each time they just voluntarily sat on the cutting board. Personally I think human nature would kick in and survival and self-worth would come into play vs. that of just allowing yourself to get harvested.
So this rating is not saying that it's a bad movie. It was very well done in terms of a slow, English film. But it just didn't have much of a point when the main premise of the movie could be bypassed if the peeps just ran away.
Rating - C