::(1. I am not a Nu Metal fan) 
 ::2. I exactly know what are you talking about. Well, as I see, you also know that after some time, nobody will know about all this non-quality, non-intelligent bands - "in the end only true metal will be left". So why don´t you just let it happen? There is nothing constructive about what you do in here. It is just wasting time... 
 ::I don´t think Nu Metal is a big problem for Heavy Metal at all. Most of "for Heavy Metal problematic Nu Metal" are just some small boys in XXL clothing like limp bizkit (maybe limb pizkit or whatever) or just a mainstream-mass-money-maker linkin park. Ok I agree these boys are quite funny, but who knows them in ten years? Do you think some of these fans read Wikipedia? They will never know how funny they are. However there are really lame bands in every of this "big" metal subgenres. You may defend black metal, but there is just shit too. Nu Metal has just the unluck to be easier missused for commercial than others. 
 ::I am not gonna tell you my opinion about metal you like cause discussions about this would have no sense. Some bands are just experiments, progression of new metal, but you just say it is a shit just because it is described as nu metal. Most of "true" metal fans have no problems with this. But what do you think - what does Venom, Bathory, Mayhem, Morbid Angel, Slayer, Sepultura, I don´t know what ever ... what do they have to do when they listen to Nightwish - Manowar - Sonata Arctica - Dimmu Borgir - Cradle Of Filth - Children Of Bodom and all this melodic orchestral symphonic medieval KITSCHY macho "beautiful-but-so-heavy" arranged COMMERCIAL pseudo metal? I dont´t know if they just laugh or cry or want to die or want to kill em' or what.. This is reality but who cares that 10% of all Heavy Metal fans listen to Power metal or whatever and 90% of Heavy Metal fans are getting paroxysm of laughter when the listen to power metal? Who is so bored to write it down to power metal discussion? Where is intelligence of macho-culture or sadomasonecroblackmetal?