I agree with the pp, they do have some value-they do involve a lot of decision making, research (like the posted article talked about, ds loves to research whatever game he's working on-giving him a chance to read and make connections between various resources), he learns how to use the internet, strategy...and I read somewhere, Utne or something, about how a lot of the skills needed for video games translate into the business world.
That being said, it can turn into a power struggle, it's not easy to put down, esp if they're in the middle of something, but I've noticed that with books too, I'll ask him to do something and he'll want to get to the end of a paragraph or a chapter before doing it. Ds is 9, I'm trying to let him make his own decisions (with our guidance of course), and he understands what's not appropriate and will even call me if he's at a friend's house and a questionable game comes up. We have had days where he's played a bit more than I'm comfortable, but it's his decision and he does go through stages, he'll get tired of it and won't touch it for weeks.
And dh plays with him, they'll work together or compete, giving dh a chance to show what it means to be a good sport
(he's not much into them otherwise, except he'll get a sports one about once a year, on his birthday or father's day-it's a lot more fun for ds to pick out than a tie). And it doesn't keep them from going outside and throwing a ball around or building a fort in the dining room, it's just one more thing to do.