My Steam profile says that I´ve played over 300 hours of "Darkest Hour", a RO1 mod, so this has to count for something. If you´re into gameplay similiar to FH2, check out RO1 and if your rigg can run it, RO2. DH, while having lower player numbers nowadays has a small yet relatively active community and Euros and Amis alike can enjoy mostly full 70 player servers. RO2 has higher numbers than that, but a somewhat different gameplay.
Btw, if anyone is interested, I also got 3 guest passes for RO2. Just send me a PM and I´ll give you one.
There´s also a WW2 mod for ArmA2 and another Eastern Front game based on ArmA2. Their player bases are rather low, though, and they´re based on ArmA2, which you either hate or get used to.