The real reason: This site hates everything that is popular.
Greenday and all similar bands
At the Gates' Slaughter of the Soul
Metallica's Black Album
Metallica in general
You assume one reason. Let me give you another:
Fast food - instead of real nourishing food, eat crap and act like a moron
Metalocalypse - entertainment for morons
Family Guy - don't know, don't watch TV
Greenday and all similar bands - horrible
At the Gates' Slaughter of the Soul - step back from their groundbreaking, awesome earlier work; assimilation by the stupid
Metallica's Black Album - a step back from their earlier work
Metallica in general - not so, there's a Metallica review on the site
Any majority - not so, but most are LCD
Coca-Cola - you pay 1500% markup for sugar water? with phosphoric acid to rot your teeth? help
Telvision - better ways to spend your time
Car - I like my car, but there are less destructive ways to travel
I guess what it comes down to is this: most things most people like are stupid, and that's how it has always been. It's the consistent pattern of the stupid overwhelming the smart with superior numbers that makes me uneasy. And what a wonderful world it has created!
You might want to go re-listen to City of Screaming Statues
and re-read the lyrics.