Bastard has said it perfectly.
If you really want to know how bad the bulk of Nu-Metal actually is try sampling most of Korn`s discography, as every release is basically a re-hash of the debut album which is actually great, but the rest is mostly dire and lets not even talk about Linkin Park. Dig a little deeper and you`ll find a myriad of terrible bands such as Papa Roach, Coal Chamber, Sevendust and POD (who actually had some talent but wasted it on nu-metal) and a whole load of post-grunge/alt metal bands that were associated with the scene such as Saliva and Staind etc. If you really want bad, try Static X with their unique formula of nu-metal meets industrial metal
The only band worth sticking with are the Deftones whose first two albums are great and the rest of the discography is decent and their nu-metal/alt metal sound is pretty neat.