I love loop movies. And many times the probability of this type of film being bad is very high since it is very difficult to reconcile things which makes the film horrible, boring story, too repetitive and script full of holes.Fortunately Source Code is an exception. A simple story, well directed, the story's problem is there, the resolution of the story is also there and that's it. But the differential of Source Code is the smart script, simple and very well done.