Does..

if you know a lot about graphics and stuff then no but considering your getting a Wii I wouldn't get it
 
Yes it is easily noticable between HD component cables and the normal ones, but it ain't mind blowing though.
 
Yes, you see the difference. Paly Wiisports tennis without them and look at the court and trees. Play with them and look at court and trees again and you will notice a pretty good difference in the texture quality and sharpness of the Mii's. So, YES, you will notice.
 
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