Review: authentically vague , but ultimately purposeless , study 
Sentiment: negative

Review: manipulative and contrived 
Sentiment: negative

Review: the star who helped give a spark to `` chasing amy '' and `` changing lanes '' falls flat as thinking man cia agent jack ryan in this summer 's new action film , `` the sum of all fears . '' 
Sentiment: negative

Review: cinematic 
Sentiment: positive


Review: it 's leaden and predictable , and