I saw a concert around 2002ish that had System of a Down, Mudvayne, and Slipknot. It was the craziest concert I have ever attended in my life. It topped Manson, Slayer, and even GWAR. It was insane.
I love seeing people deny certain bands are not Nu Metal, like Incubus. The OP straight up nailed that. I saw them in concert with System of a Down, twice during the late 90's. They toured together because they were both Nu Metal. Incubus expanded into much more radio friendly territory with later albums and drifted heavily away from the Nu Metal scene.
Good on the OP for mentioning SNOT too. They often get overlooked.
Most music is just so... unexciting. There's no soul to it. I like things that are unique, have some heart, or just sound different. That's why I love everything from Death Grips to Regina Spektor. Any music that sounds/feels genuine will grab my ear. Nu Metal often manages to get me pumped and that's pretty damn rare these days for music to have that effect.
I feel that Static-X is one of the most consistent bands to come out of the Nu Metal scene. Every album is guaranteed to have at least a handful of blood pumping songs.
I've seen Mudvayne 3 times in concert. One time was in a hole in the wall in Detroit just after they released their second album. They were late for their set and this place was packed chest to back deep. I remember it was 10 below outside and 100 inside so everyone still had coats on or in their hands despite the intense heat in there. Suddenly the lights shut off and the music kicked in, out comes Mudvayne. The lead singer walks right up to the very edge of the stage and in a half singing, growling voice he declares "I FUCKING HATE. YOU. AAAALLLLLL!" and launches straight into "Under My Skin". It was magical. That tiny venue was electric.
After grunge, I think Nu Metal was the last genre that I "discovered" and helped become poplular. Well, Industrial was in there somewhere too. Since then, other genres have been pretty lame to me. Stuff like trance, dubstep, and other techno/pop type stuff has never caught my ear.
We need another type of metal to surface!