The atmosphere in the game is very good.
The story is original.
You find yourself constantly looking around expecting new enemies to pop up or snipers to shoot you.
The AI is good, enemies are sometimes waiting for you, take cover and sometimes come out of it together to attack you.
At times they attack you from various sides simultaneously.
They try to get away from grenades you throw.
As a result you move around carefully and slowly move forward, looking around at times.
Fortunately you can lean around corners.
The variety in maps and gameplay is great.
You start in base and once you leave it, you're in a WWI trench.
For some reason you automatically start crouching through it.
Later on you get into the enemy's base, an enemy facility, go underground, etc.
I loved the train level where you start on a train, go in it, get on it, etc.
It really felt confined.
At times you have to be a sniper, play stealthy with a handgun with silencer, or simply use heavy fire power.
The mix of weapons is great.
Every situation has a weapon suitable for it.
All in all a very good game with an original story, a nice variety of weapons, nice maps and a good AI.
As for the snipers, 1 shot is enough to get killed, but that goes both ways.
Nevertheless they are at positions where you can expect them, such as guard towers or behind you.
Saving regularly is highly adviced!
Beware of suicide bomber dogs!