According to the American Psychological Association (Feb 2014, Vol 45, No 2, Pg 10), playing video games can be good for you.
Video games help people:
• Improve cognitive skills, such as reasoning and memory
• Improve problem solving skills
• Improve their mood
Therefore, when I spend a day playing video games, I am not wasting time. Actually, I am enhancing my cognitive abilities, improving my emotional well-being, and saving the world from killer zombies.
Sounds like a win-win to me!