people should stop defending Wii's poorer attach raio. it's to be expected--it's obvious that the "blue ocean" consumers would not spend as much as the "red ocean" ones. indeed, looking at just the ratio is misleading--if you're selling the same number of software units, you would like to move as many hardware as possible, which means the ratio would naturally be lower.
this ratio should, however, improve as nintendo starts rolling out "blue ocean" games, such as WiiFit, and more important, as ps2 gamers migrate to the Wii (at the moment though, it seems like this group is moving to the 360). time will tell if Wii is the true successor to ps2 or a toy almost in a separate category than the 360.
EDIT: people should neither compare opening week sales of Galaxy to Halo nor say it bombed. it's a big game. it did what it's projected to do. nothing more, nothing less. everybody knows it'll have ridiculous legs.
the Wii is an epidemic.
