Gore can be turned off if neccessary. The soldier literally fell apart, as he would if a grenade fell on him in reality. It's not as violent as Soldier of Fortune, but it is close in some aspects. So be careful how deep you go. The terrain can be very hazardous.
Minefields are another threat.
Nature can get the better of you sometimes. If you come across a minefield, use plenty of grenades to clear a path. As far as I know, scenery cannot be destroyed, but vehicles and oil tanks can be. Explosions look excellent in Hidden and Dangerous. Sound does not disappoint in Hidden and Dangerous.