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: Viewed on its own terms , Treasure Planet is better-than-average family entertainment , but true fans of the Stevenson 's novel will likely prefer Disney 's more faithful 1950 live-action swashbuckling classic .