Its simple, I like simple, content organization, and page layout is very good but the design as a whole leaves much to the imagination. the reason the Wii site works so well is because of the design's focus.
When I first visited the Wii website, the first thing i noticed wasn't the minimalist design, it was the high definition images contained within it. the wii developers wanted to focus all their visitors attention on the images so a barely visible design was appropriate.
to get the most of your design you would have to do something similar. your design takes my attention away from itself (as it should) but deposits it on the wii logo. Even before I look at the text or the site's logo i see that "Wii".. needless to say but this shouldn't be the effect you're going for.
after all of that, i still feel that this is a very good design. You should keep up the good work.