Is this the most important Wii game?

[shams]

You want to define "important"?

WiiFit is in many ways, the most important Wii title. At least to Nintendo.

In terms of a title selling well - and changing opinions on the Wii - it might be something as simple as Soul Calibre:Legends. Something that people don't expect to do particularly well - but blows socks off, in terms of sales.

Zak & Wiki will do well - as it is expected. I can't see how it qualifies as "most important" in any definition.