Its recently come to my attention that after 3 years of Wii and "tests" games, there still hasnt been a AAA title from a 3rd party released (MH3 might be it, but thats still some time away). So while there have been some very solid B titles like Madworld and Silent Hill, as well as some suprise hits like Zack and Wiki and Little King's Story (suprise, hence no/little/poor advertising), there have been no large calibur games.
So when 3rd parties complain that their game didnt reach a great number on the sales chart, maybe its because that game didnt reach a great number on the Metacritic chart either.
This is just a thought, and no research went into this thread. And yes, the quality=sales theory isnt quite that black and white on Wii (or any console for that matter), but a quality AAA game with a solid marketing campaign has yet to be even tried on Wii.
