Rather than bother to craft any kind of original, non-sarcastic response to the Mars Volta, I'll just copy and paste stuff from Something Awful.
"Mars Volta records, if you believe the people who are dumb enough to enjoy them, are ever-changing collages of noise and melody, filled with the sort of shit that hack music reviewers would call "shifting textures" and "mutating structures." Basically, that means that the album is not made of real songs, like real albums are."
"I think the general Mars Volta strategy is to inundate us with so much horrible noise that anything with half a tune stands out as pure glory. Sort of like a Guided By Voices record. Now the singer is yelling "will they feed us some hooves." Somebody feed this man some fucking hooves so he'll shut up. No matter what else is going on in this song, at least it'll always be anchored by irritating, nonsensical guitar arpeggios in the background, and plenty of cymbal crashes."
"Okay, the song is boring again, so pardon me while I go on a strange interlude: imagine somebody playing this in their car. That would be pathetic. Imagine someone cruising the streets with their windows down and the Mars Volta blasting out of their whip. If they wanted to impress anyone with their stereo, they'd have to drive around the block five times until they had something other than static, snatches of Tijuana brass, or forest noises. Eleven and a half minutes in, there's some marvelously annoying distorted hissing. Thank you for that, Mars Volta, you've won me over with your "textures" and your "structures." You know what else has textures? An iguana, and those motherfuckers will whip the shit out of you with their tails. And you know what else has structure? A nazi death camp, you anti-semites. Okay, I'm rambling because I'm bored. Did I mention this song is thirteen minutes long?"
"But the quality of the Mars Volta hate mail is incredible. These are people who say things like "The Mars Volta is not something to be taken lightly" without a trace of irony (yes, that's an actual quote from an e-mail, but it was mostly pretty boring so I won't print the whole thing here). They're absolute comedy geniuses and they don't even know it. You're just going to have to see for yourselves."
and finally
"Today, for example, there is a new Mars Volta album to wrangle. You may call be biased, but I'm predisposed to believe that it will suck. I'm sure that it will suck, and I'm comfortable with the fact that it will suck. The Mars Volta doesn't owe me anything. I'm not a fan of the band, I'm not in the habit of buying their albums, and I have no emotional investment in their existence other than a twinge of righteous irritation whenever I hear their name. It doesn't even particularly bother me that people like them. People are stupid. People like AM talk radio and urban-camo cargo shorts and Blender magazine. People are as entitled to their own aesthetically stunted taste as I am entitled to tell them how stupid they are, and as a good American, I relish the notion. Basically, I'd be fine for the rest of my life if The Mars Volta just stayed out of my way and I stayed out of theirs."