First off,the violence is over the top and worse than what you would see and a Grand Theft Auto game.You decapitate enemies and brutally murder them,and even "set free" another hero by putting him on fire,or you can sacrifice a spartan to make a certain machine work.
Secondly,there is some nudity in the game.In the beginning,there is a sex mini-game that gives you extra health and magic.All around the game,nudity is scattered around,be it on a monster or a hot woman.
The message is also not very good,as the main character is a god that finds the answer to life by killing.He became a god by killing,he gets revenge on the gods by killing,and he fights baddies by killing(duh).Basically we're looking at a spoiled brat that gets his way by killing.
In conclusion,this is an overall fun game,but not for kids under the ESRB-suggested age.