The Inferno is a lot of fun. I have only gotten to the second circle(lust). I'm glad that the development team didn't hold back. Haven't played "God of War" yet so I can't make a comparison. So far I only have two complaints about the game.
1 - The camera could be closer to the action.
2 - It would of been nice to have a look button so you could really enjoy all the stuff they put into the environment.
That's relative amigo - I don't have kids, but it seems like the kind of game a parent might have issues with. Demons, violence, and the point is an actual trip through hell itself.
Personally - it's probably no worse than the 15 year old sees in anime, most cable series, or a good horror movie, but I'm probably the worst judge of this stuff.