Task: Determine the valence intensity of the sentence, indicating a degree of positivity or negativity on a scale from 0 (strongly negative) to 1 (strongly positive), reflecting the emotional content expressed.
Sentence: Purely propaganda , a work of unabashed hero worship , it is nonetheless -- and likely inadvertently -- a timely and invaluable implicit reminder of the role that U.S. foreign policy has played in the rise of Castro .
Intensity score: 