question: Sentence from a movie review: like a medium-grade network sitcom -- mostly inoffensive , fitfully amusing , but ultimately so weightless that a decent draft in the auditorium might blow it off the screen .

answer: negative

question: Sentence from a movie review: really funny

answer: positive

question: Sentence from a movie review: ... is at once playful and haunting , an in-depth portrait of an iconoclastic artist who was fundamentally unknowable even to his closest friends .

answer: positive

question: Sentence from a movie review: is supposed to be , but ca n't really call it a work of art

answer:
negative