I was aware of that counter argument. I'm not saying that you should roll up into an interview (assuming that you got one) with nothing better to talk about than your amazing WOW character because gaming is your life and all you care about. If someone isn't really motivated by compassion toward other human beings, if they don't actually have any research interests, or any desire to have an interesting and fulfilling life, you shouldn't go out and try to mimic the people who do have those traits just to win an acceptance.
I'll go further to say that if you are only going into medicine because of prestige, money, parents, don't know what else to do... well, maybe you shouldn't. At least not until you are older/more mature/have tried something else/at least have given it more serious thought. I'm glad if it worked out for you that somewhere toward the end of the line you found some passion for it. But it would be tragic if you hadn't. The sacrifices that are required in order to study and practice medicine are perfectly acceptable if it is your calling. They are inexcusable if you are doing it for the wrong reasons. The lost opportunities to do something that you would have found fulfilling can never be recovered. You could end up chief of your department at the best academic center in the world, and still have it be a total waste of your life, if you got there by always ignoring what you really wanted in favor of what you were "supposed" to want.
I was just reading a blog that advised people not to go to grad school, because saving and investing the money they would spend on it would yield a better lifetime net worth than attending. At first, I was outraged, because commenters were thanking the author for talking them out of going back to school. Then I realized that anyone who could be so easily dissuaded from following their dreams was probably looking for a reason not to follow that particular one. That is legit. You can do just about anything, but not everything. Choose wisely.