Review: it 's hard to imagine anybody ever being `` in the mood '' to view a movie as harrowing and painful as the grey zone , but 
Sentiment: negative

Review: mutates into a gross-out monster movie with effects that are more silly than scary . 
Sentiment: negative

Review: relatively flavorless 
Sentiment: negative

Review: throws in enough clever and unexpected twists to make the formula feel fresh . 
Sentiment: positive


Review: , it would be rendered tedious by avary 's failure to construct a story with even a trace of dramatic interest .