Not that far into it but for a FPS it kicks some ass.
There have some wide open areas which makes for some large battles which are coo. Everything going on around you is interesting too. You will be moving across an area and fighting and the whole area will shake and you will only hear the roar of bomber engines as the fly over you. Doesn't change what you are doing but adds a nice touch.
I never experienced WWII combat so I don't know how realistic troop movments are but there always seems to be friendly soldiers around you and if some fall then other move up to take there place. They will also enter an area first so it isn't always you running into a room or open field alone and then have the AI guys come in after everyone is dead.
Haven't spent much time online yet because I'm not that good and I just get taken out once I leave the spawn point but what little I have played seems cool.
So over all pretty cool.