I went to www.gamestop.com and did a search based on ratings and system ... they are mostly "cutesy" games quite frankly. One of my reasons for not going Xbox is that most of the games are more adult geared.
Here are some that I saw but I suggest you do your own search and have a discussion with a gamestop employee ... they really know their stuff.
Dirt Showdown
Rayman Legends
Need For Speed: Most Wanted
Burnout: Paradise
Thrillville Off The Rails
Sports games of all kinds
Sid Meir's Civilization Revolution (personal favorite of mine)
Greg Hastings Paintball 2
Rock Band collection
I am going to be honest, if your child understands the difference between real life and video games it may be time to introduce Halo or other selections. Dynasty Warriors is a good game series that includes actual events during the Romance of the Three Kingdoms. There is plenty of fabrication along with actual facts, it got me interested in the era and history of China as an adult. Halo is played by youth in Christian churches, Assassin's Creed also includes actual history mixed with a fabricated story. Often kids find a world in a video game and find out about the real world aspects of it too. Do not be afraid to play video games WITH your kids too!