What is the main focus for creating a good movie

 

Science professor takes his two daughters to live with him after mothers'

They start school at the school their father works at. Sara is more like her mother, likes to party, outgoing, and sociable. 

Chris, her younger sister appears to be the direct opposite. A genius offspring........

The movie was an interesting plot, creative twist, bad acting.

The creators overdid caricature in a whole. The plot was forsaken. They left the twist to itself. The storytelling is more important, but you need the actual actors to respond appropriately to the story and the situations as it developed. That's realism, you go with it you don't float away from it.

The main course, It was interesting even the main structure. So, some stars I'll give it.

 The romance didn't add up. It developed too quickly and of course this amorous tension detached from the emotion of the events. Romance can be submerged around pain and still you pacify the two with good chemistry. This romance was playful continuously running from the reality of the situation. Emotions were weakened and viewers disconnected. The youngest daughter being the killer already was so moveeish. Dry. Please people do research on reaction to real life events. Regulate the troping habit so that actors can flow with the mood, dance in the twisting. Bad acting. Good story.