I was totally smitten with the PS2-version, but like with every great game that ventures to be slightly different, the sales aren't nowhere near where they should be - instead we have people buying the same sports games year after year after year. And with Nintendo's marketing... it'll be tough.
I'm actually contemplating if I should get the Wii-version or not. I've already bought the PS2-version, and truthfully, why does it feel like I buy the same games over and over - I must've bought the first Resident Evil like... four or five times. There are other games, with the latest being the excellent RE4 Wii Edition.
I want original concepts and new games dagnabbit!
That said, Okami will be freaking awesome with the free-hand drawing function. I wish it will sell like crazy. I honestly do. Nintendo desperately needs a big hit from a 3rd party developer or it'll just be another Mario-console.