Review: they presume their audience wo n't sit still for a sociology lesson , however entertainingly presented , so they trot out the conventional science-fiction elements of bug-eyed monsters and futuristic women in skimpy clothes 
Sentiment: negative

Review: clearly a manipulative film 
Sentiment: positive

Review: is an elegantly balanced movie -- every member of the ensemble has something fascinating to do -- that does n't reveal even a hint of artifice . 
Sentiment: positive

Review: to please others 
Sentiment: positive


Review: is not a bad movie , just mediocre .