Reasonable on 28 March 2009
I think the Wii can sell M rated games - just that they will sell much less than the most popular family/fun titles on the platform, and that is never going to change so anyone expecting such titles to light the charts on fire is going to be disappointed.
Conversely M rated games sell better on PS3/360, but so far look at sales of family/fun titles vs the big AAA shooters and the like on those consoles, near enough the inverse of the Wii.
There is no actual news here, just a comment on something clear from the consoles ownership demographics. The Wii has by far the broadest set of owners and can support most genres, just not equally.
Try to be reasonable... its easier than you think...
