That's nonsense, mate. It certainly isn't "all American military bad, all the time". It's not the message that i'm getting from the show over here.
The message i do get is "there are good, bad and incompetent guys in every organization, and American military is no exception."
What it does blow away is the myth that American military, admittedly one of the best in the world (if not THE best), is super-perfect ordnung-muss-sein everything-taken-into-account execution-according-to-plan-and-S.O.P. force. Excrement happens. Even in American armed forces. For variety of resons.