No, not in general. But, It's not good to become obsessed with playing video games. It's the same with anything though, moderation is the key. There's a big world out there and it's best to enjoy as much of it as is possible. Don't lock yourself into a one trick lifestyle.

If nothing else it's cathartic for people. Keeps people from murdering each other because they can get it out in GTA instead.

Research does not support the theory that video games cause individuals to become violent. The evidence is quite the ocntrary

No, but just like everything else in life, in moderation.

If I had kids below age 7, I wouldn't let them play video games. After age 7, I'd make sure they play a moderate amount and pace themselves.

It's like texting and Facebook. A little is fine but to much is gonna mess your brain up after a while.