It's been a few days since I watched the movie and I let it stew for a bit before coming to any conclusions, and what I have reached is that Eastwood was very misguided with what he set to achieve using Chris Kyle's life. I believe (especially taking into consideration his previous war movies), he attempted to make Kyle a vessel for all the other soldiers caught in this messy war who lost a part of themselves just doing their job. The horribly cliched scenes of Americana, his catalyst for joining the Army, leaving behind his life and love until he can't enjoy it anymore all etc. all points to that.
Ultimately, I think it was a really stupid decision because Chris Kyle was the exact opposite of the everyman in uniform. He loved to kill, the excuses he used to justify himself were never coping mechanisms for the war - he sincerely believed them, he took joy in being The Legend with the outrageous tally. It's no surprise Eastwood failed so horribly trying to jam this square peg into a round hole.
Also, I couldn't help but feel like the Iraqis were portrayed like terrified cows in a barn that people broke into repeatedly. It was so ridiculous.