Many slander videogames on that they are bad for the brain, many point to the fact that it susposedly effects mental health of the person playing it. But a study, that hasn't been critized says that FPS, players were 50% better at managing events than non-gamers. And kids, 5-11 who played Tetris 30 minutes a day for 2 months were found to have thicker cortexes than non-gamers. The cortex being the part of the brain that processes coordination and visual Info.
On top, most of the studies that support this are uncontested, take a look at this Forbes approved study.
This study, focused on the Hippocamus, the part of the brain focused on memory, more accurately converting Short term memory into long term. In general, Gamers remembered things, just things in general more often. And, it proved that both 2D and 3D games, improved Hippcomal assiocated memory.
Another thing, has to be the increase in attention span, Marcus Palus from Science Daily looked at 126 Studies on Video Games and found that they increased Cognitive performance.
Games, can be good for many.