I'm not a Korn fan. BUT, saying that someone sucks because they use a lot of pedals is just ignorant. You may be more of a "purist," and that is fine. Does that mean your music is more pure? No.
Whatever someone uses to get their own sound is great. Have you ever tried to sound like the guitarists from Korn? I would be willing to bet that you couldn't, even if you tried. Does that mean you suck? No. It means you have a different sound and style.
I don't have any desire to sound like Korn, but I can appreciate the complexities that go into their sound. People have always been criticized by "purists" for trying something different. One of my favorite musicians is Lou Reed. With the Velvet Underground, he used to get the most twisted sounds in the world out of his guitar. Does that mean he sucks? No, it means he was different. Can he shred like Vai? No. Does he want to? No. Still, a few years back, when Guitar Player (or one of those) compiled their list of the Top 100 guitar players of all time, he was on it. Because of the SOUND.
Guitarists are stupid, and we have always loved pissing contests. You know the joke:
Q: How many guitarists does it take to screw in the light bulb?
A: Fifty. One to screw it in, and 49 to say "I could do that."
So you don't like their playing? Get over it. I'm sure they don't like yours.
PS - When you guys say "harmonics," are you talking about feedback? That's the impression I got. Not the same thing.