Determine the valence intensity of the writer's mental state conveyed in the sentence "A tough go , but Leigh 's depth and rigor , and his skill at inspiring accomplished portrayals that are all the more impressive for their lack of showiness , offsets to a notable degree the film 's often-mined and despairing milieu .". Provide a score from 0 to 1, where 1 signifies very positive and 0 signifies very negative.