To much of anything is usually a bad thing. Schultze talks about gaming and it's effects on Christians. I don't think there is anything wrong with gaming in and of itself. I begin to worry when people are playing these games for hours each day, especially children.

Several major learning techniques are used in gaming: repetition, first person experience, rewards, visual, sound, etc. When all of these techniques are used at the same time the person playing internalizes what they are doing in a very deep way. When children are exposed to this intense experience of learning it would be somewhat negligent to assume that they aren't affected. 

Every time a violent act occurs you cannot blame it on the media or gaming but the effects of gaming also cannot be ignored. Gaming has taken many people away from the outdoors and from being more active and creative. Gaming does increase motor skills but can also increase individualism. 

So, in my opinion gaming is not from the devil but it should also not be abused (overused).