I just finished it earlier today and I loved it. Well, "loved" it would a weird word to use because of how extreme the game becomes. Let's just say it's a very powerful experience and often times downright disturbing.
In terms of gameplay it's actually quite good but there are two major faults. First the lack of weight to the guns, meaning it feels so easy and simple to fire and kill everything on your path. This flaw also stands out since the characters themselves feel heavy and realistic (which I liked). Secondly, this game is a bit too gameplay-oriented. Meaning you fight a lot of guys over the course of this game, luckily it is scaled back in comparison to other games but since this is trying to show a somewhat realistic view of the horrors of war it stands out.
Regardless I definitely recommend it. There were multiple moments that made me stunned and shocked with what was happening. I don't want to spoil anything so I'll put it in spoiler tags (nothing story/character related, just a description of a early gameplay feeling).
Like when you start killing U.S soldiers without knowing if they are your enemies or not. Especially when you can hear people scream "friendly fire" from both sides yet no one stops.I agree with people commenting on the narrative and atmosphere. It's really, really well done.