Here is an article from Yahoo!Games arguing that video games are actually quite good for you:
Games are Good for You
Five ways video games can make you better, stronger, and faster.
By Ben Silverman
My favorite quote:
There's nothing particularly pleasant about going under the knife, especially if you're wary of the surgeon's skills. That's why before making the first incision, Dr. James Clarence Rosser, Jr. of New York's Beth Israel Medical Center lets his patients know that he's awesome at Super Monkey Ball.