Humans know when it's not a good story. Unless you do this for a living, you may not know exactly why you don't like a story, but you can't fool an audience ever. They know when you have it and they know when you don't.
A love affair is like a short story--it has a beginning, a middle, and an end. The beginning was easy, the middle might drag, invaded by commonplace, but the end, instead of being decisive and well knit with that element of revelatory surprise as a well-written story should be, it usually dissipated in a succession of messy and humiliating anticlimaxes.
The job of a storyteller is to speak the truth. But what we feel most deeply can’t be spoken in words alone. At this level, only images connect. And here, story becomes symbol; symbol is myth. And myth is truth.
Curious things, habits. People themselves never knew they had them. [Witness for the Prosecution, also published in The Hound of Death and Other Stories.]
The rule I have when choosing films is the excitement factor, I need to feel excited about the story and whatever message the film has - only then do I sign on the dotted line.