I quite like them but I can't say I have bought any of their albums, whereas, I have bought every Nirvana album. My opinion is that Dave Grohl belongs behind a drumkit. Even if he isn't the most intricate drummer and, a far more educated musician/singer than KC ever was, I still can't get into the FF, lots of my friends are, they're a bit too mainstream to grab my attention, or something.
The Mars Volta are the band of the millennium!