Weekly European data only goes back to late 2004. Additionally, the data included in the weekly European data is only PS3, Wii, 360, DS & PSP.
So yes, PS3 worldwide is selling as well as PS2..in two regions..
What it looks like is the PS2 launch was indicative of it's eventual success, while the PS3 launch was Sony's momentum carrying over, then crashing against the $600 barrier. $600 is alot. I worked 4 weeks at minimum wage over the summer, and with the money I made I still can't afford a PS3 it is no surprise sales rates have dropped regardless of what you think of the content.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu