Are games bad for you?

This article over at Eurogamer reports on a study by Klaus Mathiak who concluded that "therefore games train our brains not to distinguish between what's real and what's pretend." However, to me, all he has proved, at best, is that this conclusion can be drawn from gamers playing FPS games. It seems like he's got an awful long way to go before he can prove that games in general are bad for you.