Review: this likable movie 
Sentiment: positive

Review: the advantage of a postapocalyptic setting is that it can be made on the cheap . 
Sentiment: negative

Review: almost all of its accumulated enjoyment with a crucial third act miscalculation 
Sentiment: negative

Review: as one of the worst films of the summer 
Sentiment: negative


Review: from the addition of a wholly unnecessary pre-credit sequence designed to give some of the characters a ` back story