Wii vs Playstation 2

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My son has a playstation 2 and he has heard that the graffics on the Wii are alot better, besides being able to play gamecube cames on the Wii. I have heard that the Wii is having problems with there controllers the cordless controllers. I was wondering if anyone has been having problems with the cordless controllers, or if it was a one time only deal.