Hm... the actual Article comes from a very fanboy-esque slant. But, the question he brings up (but fails to answer, in my opinion.) is a good one.
Each companies exclusives really showcase there hardware. Gears looks amazing, but so does Killzone 2. Could either game have been done on eachothers systems? I think so, but not as a 3rd party. They would have had to have been exclusives to really capitalize on the systems resources.
Are Sony's exclusives better?. As an all around package... I think they probably do. Heavy Rain, Uncharted, Gran Turismo, Killzone, Resistance, the list goes on. They really are the epitome of AAA titles.
Not to take anything away from MS, they've got Forza, Gears, Halo, ...and whatever the hell the once Fantastic RARE has to offer (Really!.. Rare.. do something!!.)
Even though I still prefer my 360 to my PS3... I gotta give the exclusives medal to PS3, I think there's just shine a little more.