This movie had a lot of potential. Set in England in the 70s or 80s (not sure offhand), it is about a group of kids at a boarding school. They seem like normal kids, and for the first while of the movie, you would think it is just a drama about these normal kids. But it turns out they are clones. Their purpose in life is to reach adulthood and donate their organs to their "originals". Some are able to donate as many as 3 times before they die.
There are 3 main characters - Kathy (Carey Mulligan), Ruth (Keira Knightley), and Tommy (Andrew Garfield). As kids, Kathy has a crush on Tommy. But as they grow older, Ruth and Tommy fall in love. If the movie didn't have the clone aspect, it would still work as a movie about these three people. But as the movie progresses, and the characters begin donating, they know their life is about to end and it becomes about that process.
The biggest problem I had with the movie is that it maintains a level of melodrama the whole time. Even when nothing dramatic is happening, the music is so overly dramatic that I became numb to it. So when a character finally does die, I felt nothing. This could easily have been a real tearjerker, but I didn't connect emotionally at all with the characters.