System of a Down

Here is what Piero Scaruffi has to say about Mezmerize:

Mezmerize (Columbia, 2005), the first half of a diptych, is both an extremely complex and an extremely violent experience. Basically, it is progressive-rock played by a hardcore punk band in a way to resemble the frenzy of a million post-industrial monsters. Ultimately, it is a rare example of brainy fury. B.Y.O.B. (for "bring your own bombs"), an angry anthem worthy of classic Dead Kennedys, and Cigaro, a close second, evoke the spirit of the late 1970s; but the acceleration and deceleration of Revenga shows artful presentation behind the sonic attack, and a post-Guns N' Roses power-ballad such as Lost In Hollywood or the sardonic musichall-in-hell skit This Cocaine Makes Me Feel Like I'm On This Song prove a perverted sense of how to destabilize the world of heavy-metal.

The second installment, Hypnotize (2005), is inferior, and can't help sounding like a bunch of leftovers, although even leftovers are worth listening to when they are leftovers from good albums (see Attack and Lonely Day).

Yeah they shift tempo alot, but I'd hardly call their songwriting complex. It's really quite simple. System Of A Down sound like a million other rock bands; they have no place here even as related.