Yeah, no, the author clearly hasn't done their homework. Since the article is about Halo SALES I assume they are using sales as the barometer so lets take a look at the real list of +1 million exclusive sellers for both platforms:
Xbox 360:
Halo 3 - 9.56m
Gears 1 - 5.88m
Gears 2 - 4.84m
Forza 2 - 3.98m
Fable 2 - 2.72m
Tom Clancy's Ghost Recon Advanced Warfighter - 2.24m
*Bioshock - 2.16m
Left 4 Dead - 2.13m
Mass Effect - 2.04m
Saints Row - 1.94m
*Lost Planet: Extreme Condition - 1.76m
PGR4 - 1.68m
Dead Rising - 1.65m
Crackdown - 1.49m
PGR3 - 1.39m
Perfect Dark Zero - 1.29m
Halo Wars - 1.15m
Tom Clancy's Splinter Cell: Double Agent - 1.14m
Dead Or Alive 4 - 1.01m
* (Game is no longer exclusive but since the PS3 version was in both cases over a year later the vast majority of the 360 sales were while it was exclusive and a PS3 version had yet to be announced)
PS3
MGS4 - 3.92m
Resistance - 3.59m
Motorstorm - 3.48m
Uncharted - 2.33m
LBP - 2.19m
Resistance 2 - 1.58m
KZ 2 - 1.46m
Heavenly Sword 1.36m
I don't think the author has a point. Sorry.
