yes, Matsuno wrote the story and script (not the color commentary stuff)
which is surprisingly good BTW.
I'd maintain that Madworld is still one of the best 'real games' on the Wii. It might be flawed, but its fun as hell, the graphics are great, and the gameplay is mechanically sound. But then again my beat-em-up taste runs a bit funny, I'm the guy who hates musou games but loved Samurai Western, so what do I know?