How is Judas priest overrated? Last 5 times I brought up there name I got a "who?" response, and they have a very nice average song quality. Halford and their drummer are damn awesome.
Also, Black Sabbath? Really? Because it's slow? That's kinda the point, what with it being HEAVILY blues based rock. Which is now known as Doom metal. Which is slow. I understand not liking the style, but how does "I don't like slow music" make a band that plays slow music overrated? Oh god, "THE NEWS SAID SABBATH WAS = SUICIDE MUSIC!!!" That was one lawsuit. To Ozzy. About a song that was on the other side of the record the kid was playing. The kid was also depressed. But, of course, it was epic music that killed him.
I agree with Slipknot 100%. It's just a bad mix of death metal and... something else... to me at least. I perfer my death metal to be... talented... or at least really brutal(see Death, Necrophagist, and Suffocation).
Nirvana is remembered for 2 reasons. Moving a genre into the mainstream, and... that guy... who killed himself... his name escape me... As such, it's overrated, but not if you look at all the music it HELPED to popularize...
Metallica vs. Megadeth people... Be quiet. Now. We all know you can't argue if you are both too stubborn to concede one point to the other. Now go hide in the corner of fanboy-dom. While I poke you with this stick.
Led Zepplin is overplayed (actually just stairway...). I would say overrated, but most people know one song. And don't like it that much anyway....
About Prog. Prog is Prog. It's... not that complicated or difficult to play, but some people really like it. Respect their taste please.
Popular music... of course. The second somebody says "best anything ever" it's overrated. And that happens a lot to shit.
Iron Maiden... not really.... Number of the Beast is overrated, but most of the fans can't seem to tell me what any songs on "Piece of Mind" are. Therefore, I render there opinion moot.
I would like to say most popular classic rock. Why? Because it has become the cool new thing to like. And as a result, I am up to my ears in people telling me how Van Halen is worlds better than anything else. Ever. I know this doesn't represent most people, but god do they piss me off.
In short (and as you see, I am all about short post's) it's all relative. If you have heard of them, they probably have a raging fanboy who claims they are "teh best". Even if it's generally overrated by people, most isn't. People have little musical attention. They only seem to have an opinion on 20 or so bands at a time. So, most stuff isn't overated. The tools can't rate it, if they don't know it exists.
About to be flamed,
Nadlice.