True, chaoscontrol, but the Wii is basically just heavilly modified GC architecture. Even if it has more power, the basic tech is still the same, so developers should already know how to use it to a large extent.
Have you seen screenshots of Far Cry or Samurai? They look absolutely terrible. Heck, Samurai looks like a late N64 game, with square hands and all. I know darn well that even on a system that they are unfamiliar with, they can do better than that.