According to the American Psychological Association, strategic games, violent fps games, role-playing games, and even casual games like "Angry Birds" can have different benefits to the players.
Playing any video games "strengthen a range of cognitive skills..." like reasoning, spatial navigation, memory, and perception. This phenomenon was especially present for the violent shooter games, where players have to think about objects in three dimensions.
Strategic games improved children's problem-solving skills. Even casual games like "Angry Birds" improved emotional health. Failures that players faced in games also helped players to build emotional resilience to failures in real life. Virtual reality games like "World of Warcraft" also taught players how to work with others.
Interestingly, playing any video games enhanced creativity, a trend not present when merely using other technology, like phones. With these results, the debate about whether video games are good or bad seems to be over.
I completely trust this article, not only because APA is the single most reliable and trustworthy source regarding facts about human psychology, but also because it simply does not have any reason to be biased about this topic. This article is not biased because it addresses some claims of people who think that the video games are bad, but counters such claims with the results found from researches.