Might want to look at Red Orchestra
Reinstalled a couple of days ago, then got the Darkest Hour mod for the western front. It's not perfect and looks quite aged by now, but it's quite realistic. And boy, playing on a 70 person server is something! 35 to a side, feels like a whole other scale than most shooter. Everywhere you go, there are people crouched and prone behind nooks and crannies, tanks moving up with people behind them, people getting suppressed for real - heck, I find myself ducking in front of the computer when an MG42 opens up! Suppression if very well done
After playing other modern shooters though, the game feels extremely slow. Even when sprinting, it takes ages to get anywhere
Kind of like ArmA, I guess, but perhaps even worse.