No, no, no. No comparing the PS2. Or Xbox. They're both power monsters.
What a strange measure of a console's quality, power efficiency? You do realize that a PS2 leaks 17,5 kWh per year when it is in standby? The Xbox leaks 3,50kWh, also please take into consideration that the Xbox has a built in harddrive, while the PS2 doesn't, so it isn't really a fair comparison..
Also, when both consoles are turned on and gaming, a PS3 uses about 13W more than an Xbox 360, so i still don't get your point?