First FPS

This is the first time I play a FPS (if exists here). In fact, I'm not interested a priori in this kind of game, but the image quality and the enthusiasm for its release has aroused my curiosity. And I have not been disappointed. The game is relatively short but it is not bored one minute because the characters interact a lot with us by giving instructions, tactics.
The script is worthy of a good action movie as the images that are breathtaking.
I did the first time in a game easy and once on Medium difficulty and I have had no trouble. By cons in hard mode, I lost patience because the damage is much greater.
I tested the network game which is nice but it's not too what interests me the most. Note that the network game is open to all owners of the game without the use of code.