The concept they used is wonderful but I think they couldnt make it as interesting they could have, with such a concept.
A robotics company were trying to make some robots that could be helpful in American Army. But people didnt like that a machine has to decide someones life as with a slight mistake can lead to loss of lives of many people. So they search a person who was almost killed by a bomb blast but his brain was okay.
They use his brain and lungs and attach the body, whatever left, with machines.
So, All in all, there was a man and robot together. He could use efficiency and power of a robot with decision power of a human.
This movie is a good one and you should watch this at least once.