Out of the bands listed as Nu Metal on Wikipedia, I like quite alot of them. Breaking Benjamin, Chevelle, Crossfade, Deftones, Disturbed, Demon Hunter, Evanesence, Five Finger Death Punch, Flyleaf, Godsmack, Kid Rock, Korn, Linkin Park, Mudvayne, Papa Roach, Puddle of Mudd, POD, Red, Rob Zombie, Saliva, Seether, Sevendust, Skillet, Slipknot, Staind, System of a Down, Tantric, Thousand Foot Krutch, Trapt. However, many of those aren't truly Nu Metal imo. Out of the core Nu Metal bands, Korn is probably the most iconic with the sound that is most closely associated with Nu Metal.

I mean when they hit, they hit though. I specifically loved Brackish and Paper Doll 

Ha, I love Digimortal. I remember my brother got a copy off his friend. I used to listen to it on repeat whilst playing Gizmos and Gadgets. Good times.

Korn is the alpha and omega of the genre.