This gameplay has narration, but not a lot of youtubers seem to give OHD good coverage and I think this actually gives a good idea of what the game feels like to play as a somewhat newer player (not calling the youtube creator a newb, they are just playing OHD with an approachable vibe).
You get ambushed a lot, things happen very fast, but also the gun recoil isn't balanced to require you to be an ultimate try hard to get kills, any gun is competitive at pretty much any range.
Yes when you die from being shot out of nowhere you don't get a killcam that reveals where the player was that got you, but that also means that when you are sneaky and get a clever position that you don't immediately get revealed the second you actually get somebody.
In short, just because vanilla Operation Harsh Doorstop gameplay is semi-realistic doesn't actually make it a hardcore game to me. In my opinion this kind of game is FAR easier to jump into than more "accessible" arcadey shooters like Apex Legends, Counter Strike or Call Of Duty games where there is a dizzying range of very specifically balanced weapons that need to be employed in certain situations to be effective or else you get steamrolled and they all have purposefully obtuse gun recoil that you have to wildly try to keep under control to get kills because you need tons of bullets to get a kill.
Nope, in OHD you just point and shoot, you only need 1-3 bullets, so you don't need to master the game to win engagements against sweaty players, you just need to be smarter and more aware than they are. Even if you flub it and miss your shots, the suppression mechanics make it so the enemy player will still have been negatively impacted giving you another chance to press your advantage.
Also sniping is a blast with the realistic bullet trajectory/mechanics!
Anyways, to summarize I am posting this video because I think it demonstrates how fun Operation Harsh Doorstop is despite appearing like it is some tryhard milsim with no fun and all military roleplaying vibes. By the end, this youtuber is a bit frustrated, but you can also see that most of the time when things didn't work out it isn't because he wasn't sweaty enough, it was because he wasn't paying attention.
Edit Also, OHD is moddable, the Casualfield workshop mod makes OHD much more into a Call Of Duty or vanilla Battlefield like game with killcams, more arcadey health and gun recoil etc... So this isn't just a sem-realistic game, it is a modding platform!