My younger brother is one of those kids who are addicted to games. For how many years he was never get rid the bad habit on giving more time playing rather than studying. This year, we let him choose for what he should see the best for him. And he said, he rather chooses studying and sports.
On my opinion, playing pc games are not bad. The only thing that makes it bad is that, when a person plays too much and forgets what the priorities in their lives are, this makes a person becomes stagnant and not progressive in life.