This anime was refreshing in the sense that it had a unique plot that we haven't seen in recent seasons. Although the MC wants revenge, the anime itself isn't revenge-focused. It's more about MC's life in the present. The war genre also adds an emotional element, and in each episode, you feel a lump in your throat due to what the characters were experiencing. This is a good emotional anime which moves your heart. I didn't cry, but it's truly heart-gripping.
As for the art, I think it's pretty standard for a 2014 anime. Not too detailed, but detailed enough. There's no awkward body proportions or movements and you can watch it quite comfortably. I think the best way to describe it is that it's got a comfortable/cosy style.
