What, the same social pressures don't apply in other team sports? Try to play any sport at a high level and miss a few trainings because you'd rather read a book at home. You'll get bad looks the first time, yelled at the second time and kicked out the third time.
(I'm not saying WoW is a sport, just to pre-empt a diversion in that direction).
What is morally superior about exercising an hour a day over playing WoW an hour a day, provided the lack of exercise doesn't make one dangerously obese or similar? Yet all rants like this one are based on that premise - 'I used to be such a loser, now I work out, I'm so much better than those WoW losers'. Usually from former players, too; just like former smokers are the most obnoxious about how awesome they are for quitting, the former WoW players seem to know something about self-righteousness, too.
Anyway, like anything, it's about moderation. If you play a couple of hours a week and don't let it take over your life, there's nothing wrong with it. I asked my girlfriend to set up the 'parental control' feature on my account, so I only got to play 4 hours a week. If anything, WoW at least lets you do that; I have yet to see the first skateboard or piano that has a lock like that, and there are many people who 'waste' (in the article's definition, not mine) much more than 4 hours a week on those.