Evaluate the valence intensity of the following sentence, considering the mental state of the author. Present a score between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Sentence: Like its two predecessors , 1983 's Koyaanisqatsi and 1988 's Powaqqatsi , the cinematic collage Naqoyqatsi could be the most navel-gazing film ever .