Holy cock, I've got some catching up to do. I don't have much time today, but I'll start with Andypoo:
Grant, I am kind of appalled that you take the anti-aesthetic relativist stance because the alternative (i.e. what you and Tom seem to think) "feels more right." That is not a very objective way to think at all, which doesn't do much to provide anyone with confidence in your judgment on the subject.
That was kind of a figure of speech, so don't hold me to that. When it comes to art, though, I think subjective notions can be pretty compelling. There are some cases where it is overwhelmingly clear that one band has more artistic value than another (i.e. Black Sabbath vs. Wicked Wisdom). It's simply absurd to deny this. I'd rather not take the time to enumerate what makes Black Sabbath better than Wicked Wisdom due to the time and research such a comparison would demand, but I trust I don't have to go to such lengths to convince you.
An easy analogy would be to compare two essays on the history of the Roman Empire - one of which is poorly written and barely longer than a page, while the other is very well-written, detailed, and gives the reader a circumspect understanding of the time period. Clearly one of these essays has more value than the other. In a similar sense, some bands convey more ideas through their music than other bands do, or convey them in a clearer and more immersive way, or give the listener a kind of circumspect understanding of the subject matter, be it verbal or meta-verbal.
Even if aesthetic objectivism (or whatever the hell it would be called) tends to come across as "conjuring facts out of nothing", the above example and analogy should show that the pitfalls of relativism are at least as absurd, if not more so.
Also, just because someone doesn't present an argument about something does not mean they are less educated about the subject than others who relentlessly formulate and present decisive opinions are. There may be many reasons such people hold back, and generalizing does nothing to formulate any objective theory about why they may or may not stand firm in any convictions they may have re: art or judgment of art.
First off, as Tom has already pointed out, critiquing art is not merely an exercise of generalising about it. It's about attempting to articulate the ideas and impressions the art conveys - to get at the 'essence' of the art. I think critique is an important part of being educated in a form of art - or, at least, in putting one's knowledge of it to use. One may certainly still have a great deal of artistic knowledge and merely refrain from expressing critique out of humility or worry that such efforts may "spoil the magic" of the art. That doesn't mean it isn't useful to explore through critique what makes a work of art magical, though - on the contrary, it can help others to see the value in a work that they may be unable to see on their own.
edit: as an addendum, my main problem with viewing aesthetics and their draws to human senses as "objective" effectively negates the reason and meaning of art as cultural, creative, diverse work. Humans want to categorize everything; statistics bombard people everyday, people obsessively make lists, etc. But art is, to me, the one thing that people cannot and should not ever want to be segmented into defined terms of "good" vs. "bad" as a chart or organizational tool would for everyday statistics and information. Art is the penultimate bastion of human expression, and, within this expression lies the beauty which anyone, from an infant to an elder, can recognize; yet no person recognizes all the same things as beautiful. I believe this is testament to the fact that I find aesthetic objectivity to be, in all cases, debasing and pretty much shameful. End of story (imo).
I understand your concern, but like I said, Wicked Wisdom is simply not as expressive and culturally meaningful as Black Sabbath. I don't see why you treat art critique like some scary, destructive thing that dehumanises art. On the contrary, I think it's a great disservice to humanity to allow highly expressive and highly meaningful art to fall to obscurity just out of some notion of equality. It's not just about 'forcing everyone to listen to the same thing' - there can be great art in any style.