I don't think this guy has any interest in listening - he just wants to complain. He doesn't even understand what a warranty is. He thinks a warranty means you can return it anytime within the warranty period. That just is not the way a warranty works.
His complaint is about the store policy from where he bought the Wii. Stores such as Best Buy have very strict rules on when an item can be returned (or if it ever can). Those are store policies and have nothing to do with Nintendo.
Nintendo is responsible for the quality of the product - not the retailers return policy. In this case Nintendo is above many other electronics companies. They offer a full 1 year warranty and will promptly at no charge repair or replace the system. What more can you ask of them? My daughters DS broke a few months ago and I sent it to Nintendo and had a replacement within a week. No questions asked.
There is no reason to flame everyone here as being Nintendo "fanboys" for being responsible enough to know a stores return policy before buying a product. Why don't you go to a Playstation board - you may just find they will give you the same answer. I do not know your age but you need to teach yourself the basics of return policies and warranties. Otherwise you are going to find yourself disgusted every time you make major purchases through your life.
Example: Go out and buy a Ford car with a 5 year warranty. After a few months you return to the dealership and demand your money back. It has a bad alternator, and if you had known when you bought it you never would have made the purchase. Good luck getting the dealership to take your car back and good luck posting on Ford bulletin boards with 'For Shame Ford'. I'm sure the Ford "fanboys" will for some reason think your demands are a bit unreasonable.