I think they ignored the fact that people buy the Air because it's ultra thin and light.
I mean, the Alienware they are comparing it to for example has a height of 1.29 inches whereas the Air is 0.11 to 0.68 inches.
Then for weight the 11" Alienware is 4.39 lbs but the 11" Air is 2.3 pounds.
Obviously there is merit in these alternatives they are rating but I wish they put some value into the thinness and weight numbers that people buy Airs for.