I think the biggest reason the games have failed is because they are seen as dumbed down versions of their HD counterparts.
Dead Space for example saw a huge graphics decline and was stuck as an on rails shooter. Both major declines for the HD Version even if the game was still very good.
Call of Duty World at War Major graphics downgrade, and no online serious hurt this game compared to the HD versions. Yet it was pretty good shooter especially for the Wii and did break 1 million.
Add in the fact that many of the best 3rd party games are just not on the Wii and it is easy to see why people call it a failure.







