Remember to look at other graphs as well. Looking at PS2/XB/GC sales from launch, the PS2 was easily beating both consoles for first year sales.
In comparison, for PS3/360/Wii, the PS3 and 360 are tied, but the Wii is far out in the lead.
So, yes, the PS3 is selling at about the same rate. However, for the PS2 that meant selling the same as the other consoles...for the PS3 that means it's far behind the leader.
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Remember to look at other graphs as well.
Looking at PS2/XB/GC sales from launch, the PS2 was easily beating both consoles for first year sales.
In comparison, for PS3/360/Wii, the PS3 and 360 are tied, but the Wii is far out in the lead.
So, yes, the PS3 is selling at about the same rate. However, for the PS2 that meant selling the same as the other consoles...for the PS3 that means it's far behind the leader.