There is a big difference between loving gaming and spending a lot of time with it, and letting it ruin your life. The question at hand was is gaming a waste of time, not "can gaming possibly screw up one person's life through them making bad decisions related to said gaming."
When I say people who dedicate their life to Starcraft, I mean the pro players, pro commentators, and producers, some of whom make over $200,000 per year doing this. Their resume is Starcraft.
Keep in mind, after all, that SC is the fourth largest sport in Korea.
It boggles my mind that some people consider any other hobbies that they don't understand to be a waste of time, no matter how much the people participating love them. What does the outside world think of Hi-Fi? Probably that it's a waste of time and money.
Gaming is a big part of who I am, and therefore is part of what defines me. Am I antisocial? Heck no. I'm as social and well adjusted to society as anyone. But gaming is something I really enjoy.
A Starcraft commentator once said that there is nothing in the world more cool than being proud of the things that you love, and I'm inclined to agree. Do what you love, and don't give up on the things you love just because other people don't understand them.
If you just want a normal life, with a job that you hate, but pays the bills, and just ignore the things that you love, then your life will be miserable.
I want nothing more in life than to simply be happy.