Evaluate the valence intensity of the following snippet, considering the mental state of the author. Present a score between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Snippet: Insomnia loses points when it surrenders to a formulaic bang bang, shoot em up scene at the conclusion. But the performances of Pacino, Williams, and Swank keep the viewer wide awake all the way through.