The only decent acting was by Thomasin McKenzie. I'm a fan of Ben Foster but he did not shine in this film. He was unconvincing as a loving father and the bond was just not there as it was coming from his daughter. Perhaps that's how his character was written, and if so, that's a huge writing flaw.
The directing was ok but flawed with the overly dragged out scenes. The writing however was terrible. Perhaps it was the sleepy pace and way too long run time of 109 minutes for such a boring pointless story. This film would have been better off as a short. The editing failed as well, as this film needed either major cutting or more back story - if it was edited out of course. If not, then the writing was worse than I thought.
I get that he had PTSD but the story could have been told much better and in a shorter time such as one of my favs, Man Down with Shia LaBeouf.
A generous 4/10 from me.