So I wouldn't call games "not addictive". If anything, watching something on TV is often less adictive because you are told a story with its introduction, climax and ending(up until the Netflix ruined everything with it's endless shovelware).
IMHO, the key is moderation. A day with diverse activities is a day well spent, kid or adult.
Today, if I play Sid Meier's Civilization, a day or two would be completely gone and I will be disconnected from the reality and I will need to re-adapt to the real world. I suspect, excessive gamings primary risk is developing unhealthy understanding of the world in the area where the game simulates the real thing.