I do not get this kind of attitude.
I have not tried gaming all that much on mine but from what I have tried, it is pretty apparent that it is capable of playing older games that are still popular, such as WoW and Source engine games at the very least. SC2 seems to work judging by Youtube vids. So it really is not as bad as is made out in terms of GPU capabilities.
The main things that put me off using it as a gaming machine though is the relatively noisy fan, as well as the temperature and much reduced battery life for such intensive tasks. But if you can live with the fan noise and have it on AC power, you can have some fun with it. And it is no worse in this respect than for such as Handbrake (the obvious difference being that I usually run that whilst I am not sitting with it the whole time,doing other stuff).