Research on the effects of video games is a mess. Sorry to be so direct, but it is. On the one hand, there is evidence that video games can improve cognitive abilities and emotional young (and not so young). On the other hand, there are numerous studies that link them with behavioral problems, violence and an increased risk of developing addictions.
The battle between those who think that video games are the wrong done bits and those who believe they are a good thing dates back to the popularization of the first games in the seventies. Although, as always, there are intermediate positions: a team of researchers from CIBERESP argues that the key is not whether we play or not play video games, but how we do it and, above all, in how we play.