In direct contrast to someone above me...
I, in all honesty, have no idea how anyone can even ENJOY The Mars Volta, much less like them more than Sparta.
Is it really that mind boggling that someone would have different taste than you? Thats directed to Tartar Martyr too.
I understand that musical preference is completely subjective. People may like things that I do not, and it's fine. But with these two you have Sparta which is your cookie cutter pop-rock band circa 2005, and The Mars Volta which is at least trying to do something new.
It just seems like tmv is falling victim to the "too many people like them, they aren't cool" thing. Which leads to people saying they just make noise etc. which is definitely true in some cases (part of the reason I like them so much, I love guitar noise), but unlike many noise bands, these guys have some serious chops. All of them. So in my opinion it gets to the point where even if you don't like them you should respect them, like Yes, or King Crimson (but only in the 70s). Bands that put together some truly mind blowing stuff.
atdi was nice, but no one will care about them in 5 years. I don't know many people who still listen to them now. I'm not saying that tMV is going to be legendary, but they presented a very fresh, very unique product in De-Loused in the Comatorium. Frances was weighed down by the silence, or mind numbing loops that occupied 20 minutes of the disc. It needed to be cut down. But it is still more fresh and innovative than 90% of what is being released today.
Listen to Drunkship of Lanterns, or Take the Veil Cerpin Taxt. Don't get caught up in the lyrics. Just turn it up loud and feel the music. If you get bored or fall asleep or just don't enjoy it, go back to indulging in My Chemical Romance, or Deathcab or whatever.
So I have kind of forgotten what I was talking about at the beginning. This is what I was trying to say.
Sparta = generic, who cares, sound like handfuls of other bands
The Mars Volta = innovative and unique in todays music market