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

Review: is nothing redeeming about this movie . 
Sentiment: negative

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

Review: melds derivative elements into something that is often quite rich and exciting , and always a beauty to behold . 
Sentiment: positive


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