What do you mean, easiest setting? I wasn't aware there was a difficulty slider, unless there's a singleplayer mode I'm not aware of (I haven't booted up the game for a few weeks so I can't remember, lol).
I know RO2 had a singleplayer, but it was basically just multiplayer with bots. Red Orchestra has always been a multiplayer-centric game.
Just to be clear: I only play single player games. I can't stand multi-player games due to all the cheaters and 14 year olds (like my son) who have 24 hours a day to practice vs my 1 hour a day.
On single player, I believe there was "Easy", "Normal", and "Hard". I could be wrong, however.
Regardless, I found the game hard. Hell, it took me 20 minutes just to get through basic training with the rifle. You had to hit 5 targets and 2 of them were way, way, way out there. Didn't matter how I adjusted the sight, I couldn't hit those targets. And yes, I know about bullet drop. I was aiming above the target. I finally got past that, but it wasn't skill....just luck.
I tried the first mission (storming that church) and got my ass handed to me a lot. I gave up in frustration. The game is beautiful. And I love WWII shooters. But it's just on another level compared to the CoDs and MoH's that I'm used to. All IMHO.