No, Asus has been a leading brand for years. ASRock (which used to be a division of Asus, before splitting off) however has become more popular recently.
Alienware has always been a good manufacturer, albiet highly overpriced. They cater to a specific demographic (expensive, and exotic looking) that people buy mostly for the name.
Also, before Dell bought them a few years ago they had phenomenal support, but that pretty much disappeared. Now they are just really expensive flashy dells. Still a good machine, but not worth the price.