Game is good because its not pre-set straight forward run like in COD and other shooting games. You can experience any kind of situation in the battlefield just like in real life.
Like Snake said: dragging wounded comrade in spite of the enemy arty fire is something like a scene from ''Saving private Ryan'' :P
And we had many similar experiences during our online game. I mean, its very close to real fighting conditions. Your enemy is constantly on the move, trying to encircle you, or flank, so if u just stay on one position you are dead. Also, what u can see you can shoot, so if he is behind some foliage not moving u can pretty much get bullet and ask what happened? But the same conditions works for your solider.
I mean, its not always that u have to lay down on the ground and wait for enemy chopper (that is looking for you!) to pass. Then run for cover, then again lay down and be still hoping he didn't spotted you.

Things like that make really good atmosphere in this game.
But its not for those who wish to became really good at it really fast.
Btw, Snake, I improved my landing with the chopper. I know how to easy land now. :P