We'll you know they'll release another Naruto game next year which will be better, like how the ones for Gamecube got better every year. So if the Wii freeloader takes along time to come out I'd recommend waiting until they release Naruto Shippuuden: Gekitou Ninja Taisen EX 2, because it's usaully worth the wait.
Buy these yearly franchises every 2 years, that's what I say. That's why I only bought Naruto 2 and 4 for the Gamecube since it works out the best this way, because the sequel will actually feel like a big improvement.