Viewtiful Joe is a masterpiece in my opinion. It really brought me back to the old school days of yore yet still managed to throw in a couple of cool new ideas, most notably Joe's VFX powers. The game was also incredibly stylish and its cliched B-movie plot and cheesy dialogue was awesome.
2 was just as good, but suffered from the fact that it didn't really offer anything new. Also I prefered it when Joe went it alone. Still, I'd rank the two games as gems from the 128 but era.

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Thanks to Kynnella for the sig.