While Black Ops 2 is very tame compared to Black Ops and World at War, it is extremely graphic and very gory.
In the mission "Time and fate", Menendez sister Joesephina is grabbed by an enemy and thrown against a mirror. Menendez grabs a piece of shattered glass and stabs him in the neck reapetedly til' death.
Whenever someone is shot with a pistol, SMG and light weapons, a very large amount of blood gushes and may stain the environment. Bulletwounds will also appear and if the enemy is shot more, multiple wounds will also appear. Unlike Black Ops 1 and World at War, blood will not continue to splatter all over the surrounding.
With more heavy weaponry, Light/Heavy machineguns, Sniper rifles and shotguns, can on rare acusions blow their limbs of. This is very tame, but when it happens it is very graphic.
In the level "Pyrrhic Victory", a man trapped in a vehicle burning alive. In the beginning of the mission we see his bloody handprint on the window. We then hear screaming and see his charred flesh and face. It is very hard to watch this scene.
Later in the level, the player will find a crate filled with rotting bodies. This scene is very disturbing, graphic and disgusting.
In the level "Old Wounds", Kravchenko is tied to a chair for interrogation, during which Woods stabs a knife directly into his hand. Kravchenko is shown reacting in pain. It is not particularly graphic, but it is very disturbing. The same interrogation features Woods cutting a piece of flesh out of Kravchenko's face, next to his eye. This is only a little graphic but is very disturbing and intense.
In the level "Time and Fate", the players take on the role of the main villain going on a very violent rampage with a machete and shotgun. Ample amounts of blood and gore are present and the screen is glowing red.
In the level "Suffer with me", Menendez ties Hudson to a chair, picks up a shotgun, and shoots him in both kneecaps, causing much visible blood and gore. Hudson is seen reacting in agony. Menendez then cuts his throat with a necklace. This scene is very graphic and difficult to watch.
In one of the endings, Menendez will violently kill Woods with a knife. After this, He digs up his sister's grave. Seeing her dead body, he douses himself and gasoline and commits suicide by burning himself to death.
The Zombies mode is very gory and intense. Whenever a zombie is shot, lots of blood will appear, but generally, their limbs can easily be blown off with most weapons. Zombies heads will frequently explode when shot. Often, if a zombie is shot in the stomach region, guts fly all over the room.
This is where most gamers will spend the majority of their time. Blood still gushes from wounds and frequently stains the environment when enemies' are shot. If you get a headshot on a character, the character's head will jerk backwards sending a few chunks of gore but in actual gameplay it is not very obvious at all. In fact, you can't really notice unless you are very close or it is on a final kill cam.
Do note that all of the explicit blood and gore can be deactivated in the options menu, making the violence much less graphic.