I already played on some Hardcore Realism server, not bad at all. One needs to kill his spare time at work in other ways except cRPG. 
Did you ever play the original Red Orchestra? or the mod that makes it 10x better Darkest Hour? Darkest Hour is still better than RO2 in my opinion.
I waited 4 years for Red Orchestra 2 and it was a mahugesive failure. The game developers promised realism and historical accuracy but they made a god load of historical accuracy mistakes in the game.