I wouldn't say that. I played Zombie U, that game will freak children out. It even freaked me out, because I was afraid I'd start out weaponless and have to run from zombies.........and my fears were realized.
And have you played the Wii game "Madworld"? Blood and gore EVERYWHERE.
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That's why I used the word "typically" instead of "always". I'm aware of dark stuff on the Wii U, but typically it's still the family friendly console.