Who are they, IYO?
I think they are bands who got a big mainstream attention and that's a main reason why they're so famous with youngsters today as Slipknot, Disturbed, Avenged Sevenfold, Lamb of God and the likes. That's a bad thing. Unfortunately some talented, great metal bands are totally "out of the spotlight" and they suffer to be obscure metal names to a wider young public, whilst these commercial bands are pretty successful and popular.