This game is very fun for shooter fans. It has a fair amount of blood and the gunshots can be put into slow motion, which is worse. Blood splatters, there are marks on the enemy, and blood is projected onto walls. I have shot enemies in half at times, too. It does have some VERY jumpy scenes in it, and this causes you to feel terrible throughout the game. Every corner you feel reluctant to turn, because there could or could not be something there. But aside from that, if you can deal with jumpy moments and the blood, you will enjoy this game. Some examples of violent or scary scenes are:
When climbing down a ladder a zombie-like figure rushes towards you. Some of it's skin is missing.
You head towards a door and find it is locked, then turn around and Alma, the evil girl, is directly in front of you.
There are some "dream" scenes which involve you swimming through blood etc.
Also, the game features a weapon which nails enemies to walls.
If you can handle this, you will enjoy the game. I personally think BioShock is worse in terms of adult features.