None of the above
Does gaming rot minds? Does it improve hand-eye coordination? Does it make you anti-social and dangerous? Does it make you go blind? Should you not ask the question, just read the box before you buy it?
Here's a different and interesting view. Professor Talmadge Wright and colleagues at Loyola University, Chicago have examined the social aspects of online games, specifically Counter-Strike. (Here's the same thing in German.)