Harmful

• Violence
  • The violence from games like Call of Duty can lead to violent nature in the players, especially the younger ones.
• Prolonged Exposure
  • Playing video games for long periods of time have been observed to cause “higher levels of both externalizing and internalizing problems and lower levels of prosocial behavior and life satisfaction.” ^[1]

[1]- Pediatrics: The Official Journal Of The American Academy of Pediatrics by Andrew K. Przybylski

Beneficial
On the other hand, video games can:

• Teach powerful problem solving and logic skills.
• Improve hand-eye coordination.
• Teach multitasking skills.
• Teach the players how to simultaneously track multiple shifting variables (changing things) and how to manage multiple objectives.