You are right about the hip hop influences, I haven't noticed them on Korn's Debut, but Jonathan Davis does not rap and never had ("Fuels the comedy" is the only exception). It's hard to truly draw a line between what is Nu metal and what is not, but I think it's easy to detemine the ideal Nu metal sound.
As for System of a Down and Godsmack it's pretty similiar case to Deftones Nowadays. You can pinpoint some riffs that are groovy and easy, but overall they moved to a different genre. In System of a down and Godsmack Nu metal was always one of many elements creating their sound, but not prominent (maybe 15% or 20%). But they have some songs with obvious Nu metal riffs. System's Debut has a lot, with "Know" probably the best example, while Godsmack has the main riff of "Speak" (perfect example of what Nu metal truly is) and the bridge of Awake.
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