It is underpowered because Nintendo didn't see the appeal of HD gaming. It tops out at 480P... The Gamecube could do 480P. More than four fifths of the games are shovelware, regardless of which method of acquisition you want to include (VC, WW, Retail). Is it innovative? sure it is, but I have two in this house and I play neither.
Also, notice how most of the games on your list barely use the motion aspects at all? The biggest reason for the console existing and some of the best games on it can forgo that aspect entirely.