I like how you can realism of throwing grenades 300 yards. The multiplayer is okay if you can find a rifles only server that doesn't allow nades. Otherwise, it's a contest of whoever has the quicker reflexes.
The single player was okay once you got past the Russian missions. Just a hint, you must run up on the enemy in the Single Player missions or they keep respawning (like in real life).
Else, you'll never advance the level. The worst aspect to the single player is than once the mission gets interesting, it's over. I remember one mission where you're pinned down in a German city with the Nazi's attacking from all sides. I thought, this is really cool. Well, this epic battle was over in about a minute.
I just wish there was a WW2 single player out there that was realistic when it comes to what this era of guns could do to a person. When you shoot someone in the head with a 30-06 Springfield, they shouldn't get back up and shoot back.