I am on Mission 6 act 2. The sneaking around the village to assassinate high-ranking commanders is a blast. The crossing dam was a good mission too. Whole game is pretty darn good.
Other than the "Halt" you hear when spotted, game great in none of the charters act the same or have same dialog (though they all sound the same with the German accent).
But on multi-player games - I am totally lost on what to do.