Though I don't think Team Ninja was to blame for Other M's writing? I thought they only did grunt work.
More or less. Other M's plot and concept were thought up by Sakamoto; Team Ninja were approached due to SPD 1's small headcount and inexperience with 3D. They tried to argue with Sakamoto on some points according to the Iwata Aks (biggest being that they pushed to use the nunchuck, while Sakamoto saw it as "cheating" [???]), but they were mostly rebiffed.
>brings in team experienced with big budget 3D games because yu cant do 3D gaem
>promptly ignore said team's advice about how to do 3D gaem