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

Review: delivering a more than satisfactory amount of carnage 
Sentiment: positive

Review: lopez 's publicist should share screenwriting credit 
Sentiment: negative

Review: the all-too-familiar saga of the contemporary single woman 
Sentiment: negative


Review: each scene immediately succumbs to gravity and plummets to earth .