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for the most part , the film is deadly dull 
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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 
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messy , uncouth , incomprehensible , vicious and absurd 
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gaping plot holes sink this ` sub ' - standard thriller and drag audience enthusiasm to crush depth .