The first time I played this game was in the 2020s, so I'm not being nostalgic when I say it's one of my shooters. They don't make games like this anymore (please tell me if I'm wrong). The things this game focuses on would be considered unacceptable in shooters made today, because contemporary FPSs prioritize multiplayer. This game has you desperately avoiding damage by exploiting cover and distance, using these tactics in a multiplayer FPS is considered unsportsmanlike.
One time I was playing this game on the Hardened difficulty, I was in the Soviet campaign. After the charge in Red Square, I was alone. I wondered if the surviving members of the charge would show up if I waited, so that's what I did. To my surprise, some Soviets did. No other game has had me *Truly* worried I'd be shot, and decide to wait for reinforcements I *Truly* wasn't sure were coming.
Here's a funny story: I didn't know there were quick saves. Partway through my Hardened run, I decided It would be okay if I saved every time the objective changed. It still took me so long to beat, that I forgot I wasn't playing on the Veteran difficulty. Later I started to doubt I had beaten Veteran, So I started a new game. I was horrified to learn that there were no health items.