I wholeheartedly agree that even the most sordid of genres do have these bands that transcend its limitations and drawbacks and are genuinely great.
In nu metal no other band epitomizes that for me as much as System of a Down. Their juicy Orientalism (for once supported by an actual heritage), their Zappaesque musical schizophrenia, their weird ability to mix raw, genuine emotion with political potshots, quirky hilariousness and downright dadaism... I can hardly understate how important that band was for my musical development at a particular time - especially regarding pretty much all voyages beyond Western-type diatonics and all sorts of genre busting. Also, Tankian's vocals are definitely not for anyone, but they are surely quite unique, sounding like a muezzin here, like a mysterious, gentle folkster there and belting out these almost grindcorish grunts in yet other places. To me they are not just undisputedly the best nu metal band, but also rather high among general rock and metal bands as well.
Or take the general high standard of Deftones, whose each and every album has something to offer even after multiple listens. I'm not a hardcore fan by all means, but I still give them a listen from time to time and albums like White Pony or Saturday Night Wrist belong IMHO among the best stuff the 00's had to offer, rock-wise.
Or Sepultura's Roots. Now I'm gonna piss off pretty much everyone and say that for me it's the most intriguing and fun Sepultura album overall. I'm not knocking down Remains or Schizophrenia, but Roots (paradoxically, for an alleged "sell-out") is much more unique, boasting with personality that is often somewhat lacked in the wider thrash/deathrash paradigm.
Or even the first few Slipknot records. Sure, I'm not really all that enamoured by them, in fact I find a lot to dislike there and you won't find me recommending them pretty much ever, but still, I can't deny there's something to be respected about their approach and at least they truly give this no holds barred punch which gives them certain edge ('cause nu metal's supposed to be edgy, right?)
Compared to those, I can't help but be really disappointed in how little LP's music has retained its power, significance or intrigue for me. For all their hysterics they sound rather hollow, they are incredibly easy to overplay (doesn't help that the catchiness is sometimes bought with mere volume - Crawling's chorus has three notes altogether. Three.) and the occasional experimental track like Nobody's Listening is not enough. No punch also, no sense of danger, they're just "radio angst". On the other hand, sure, at least there was some semblance of identity then. When they switched it to play generalized "alt rock", they lost even that, effectively becoming a Gen-Y's prototype of what Imagine Dragons would personify for Gen-Z.
But IRYO.