A number of very good pieces on why the movie is so bad–
Chris Hedges calls it as it is:
“American Sniper” lionizes the most despicable aspects of U.S. society—the gun culture, the blind adoration of the military, the belief that we have an innate right as a “Christian” nation to exterminate the “lesser breeds” of the earth, a grotesque hypermasculinity that banishes compassion and pity, a denial of inconvenient facts and historical truth, and a belittling of critical thinking and artistic expression.
The Guardian sees the film as representing a bigger problem with America:
Solipsistic in its suffering and narcissistic in its impulses, it promotes itself as the upholder of principles it does not keep, and a morality it does not practise. This alone would barely distinguish it from most cultures. What makes the west different is the physical and philosophical force with which it simultaneously makes its case for superiority and contradicts it.
And of course there’s Matt Talibi over at Rolling Stone:
The thing is, the mere act of trying to make a typically Hollywoodian one-note fairy tale set in the middle of the insane moral morass that is/was the Iraq occupation is both dumber and more arrogant than anything George Bush or even Dick Cheney ever tried.