CiG
Approximately Infinite Universe
Thinking on it, my issue with most nu-metal is when they're taken as a whole, because there are many bands who aren't nu-metal that have incorporated nu-metal influences to good effect. Obscura by Gorguts is a common example around here so I won't bother going into detail but there are other bands like Alienation Mental who followed up their technical deathgrind masterpiece Ball Spouter with Psychopathicolorspectrum that utilized many nu-metal elements and it sounds great.
Korn are probably for me the best of all the nu-metal bands, not just because they were one of the first and therefore can at the very least be considered original, but I agree with Tera they do have some cool riffs and an overall twisted kind of sound that I find appealing in certain moods. I'm pretty fond of the demo version of "Daddy" with its similarities to bands like Acid Bath, you can hear a good bit of Ministry in Korn's demo and debut as well.