I have never ever played a game that's in a letterbox in my Wii. And I have several of those games you listed. For instance I have RE4. It look full in my TV.
Obviously because the Wii is NOT Widescreen (you didn't know that, did you)
Since the Wii is not widescreen we all have to zoom the image in our TV after selecting the "Widescreen" option in the Wii settings.