The exclusive Japanese iterations of Winning Eleven 2008 are highly sought after today for several reasons:

Teammates in these versions make more intelligent runs and will actually point to the space where they want you to deliver the ball. Pro Evolution Soccer 2008 - FAQ - Wii - By MasYblam

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While the West focused on next-gen consoles, Japan witnessed exclusive optimization for the PS2. World Soccer: Winning Eleven 2008 Ubiquitous Evolution and subsequent Japanese club editions squeezed every ounce of power from the legacy hardware. It utilized the refined PES 6 engine, widely considered the pinnacle of arcade-simulation balance. For purists, the PS2 version was the true "exclusive" gameplay experience, free from the engine physics bugs plaguing the newer consoles. The Nintendo Wii Revolution