These days i bought a copy of RO and started playing it, for a few days, it's been fun, yet i found that there are no substitute for FH2.. yet.
I am not saying RO is a poor game, but FH2 makes the battle more realistic feel compared to RO, which had many more "realistic" details, i love how FH2 combined simplicity and historical accuracy.
i want to share my view in a few aspects...English not my mother language so skip the proofreading part.
1. Tanks
Why FH2 is superior to RO in tanking? you might say, FH2 tanks are "unrealistic" because they have majical views, one man crew... while RO have driver and a commander, more realistic views, better tank sights...
I think it differently, having those "realism" details doesn't necessarily makes the tanks behave more realisticlly in the battlefield...
in real life, a tank is of course not 1-man crewed, however, the crews are well trained, having good cooperation, you could think of it as 1-man, instead of in the gaming world, when there's a Japanese driver and a Russian tank commander, it would be a chaos....
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(imagine the commander saying bad words because the driver don't stop when he wants to fire)
so making 1-man tank is a good abstraction, and makes tanks behave realistically in the battle. And more importantly, it doesn't suck up so many players to operate a tank efficiently.
at what point the FH2 tank combat model is insufficient? the realistic penentration and the interiors... shells stucking in the tank and kills everyone inside. However, a 1-man model is still possible as you don't need a human player to play as the loader, the radio operator, and the driver, could be a bot, as well, as long as he(the bot) doesn't get shot and you can move the tank around as the commander.
2. Infantry
RO got bunch of better infantry details, such as the weapon resting, the bayonets, the machine guns, and, cooking of nades and more importantly, the choice of favourite weapons and the picking up system.
it's 50:50, althought FH2 is "inferior" at those points, FH2 don't have insane grenade spam (cept a few maps), FH2 don't have suicidal satchel chargers, and more importantly, FH2 got a large variety of weapons, such as the riflenades, the anti-tank grenades... etc
the most annoying part of RO is, the grenade spam, you don't even need a SMG in close quaters, you only need a grenade with fuse pulled.
and it's also funny that the Russians use panzerfausts against tank and had nothing else to defeat the tanks cept the AT rifle.
althought the RO weapon picking system is nice, it often works very poorly, spending half a minute just to collect the ammo and the PPsh you badly need...

of course it often end up with a Russian poping up with another PPsh near you.
3. Map designs
well i can't comment much on FH2's maps but i really appreciate the lack of spawn camping in RO's maps, and there aren't any men magically spawning in the area supposed to be combat zones.
4. Gameplay (general)
RO is full of TKs... why? no minimap icons(the players), pull the nade, charge, and throw.. end up nading a squad of your teammates.
having the minimap icons doesn't always means unrealistic, as a soldier in real life, i suppose he would be knowing where his comrades go before moving to action(spawning), in games, it's impossible, after you died you just have fun viewing the cameras ... how could you grasp what's happening out there?
FH2 had another strenght, the air supports, it adds another element on the battlefield, however i did feel that there's a little bit too much strafing runs.
FH2 is a nice game, i never got bored in the desert, only the lack of players makes me bored...

and that's all i want to say !