To its credit, the PS3 seems lacking in exclusive shooter games compared to the 360. Since the majority of the people who declare that the PS3 has no games are gun-toting frat boys with 360s, it doesn't seem that odd for this stigma to continue.
By the way, that was a pretty terrible list. You include games like Pure, Mirror's Edge, and Motorstorm 2 while forgetting games like Boom Blox, De Blob, World of Goo, etc. Doesn't seem like the most fair list to me.