Video comparison of a Wii game (on the right), that was ported to the Xbox 360. This is No More Heroes: Heroes Paradise, a game with intentionally low-fidelity "punk" visuals. Looked good enough on the Wii for me.
This might be the originating site. Whether it is or isn't, it also has a comparison of loading times, not that loading times was a problem No More Heroes had.
No More Heroes: Heroes Paradise is being released in Japan on the Xbox 360 and PlayStation 3. The original Wii game, a cult favorite, spawned a sequel, No More Heroes 2: Desperate Struggle, which was released in the U.S. on the Wii earlier this year — and reviewed by Kotaku.