They're too political for their own good, every song seems to be eclipsed by the questioning nature of modern political application and its limitations, and lacks really any grace in comparison to say the messages hidden within the works of bands such as Thrice.
They've always appeared a bit hit and miss in my eyes, Siren Song (album) is proof of this, it has a few gems (like the final four tracks on the extended version) but everything else is quite mediocre and samey and I find myself getting turned off quite easily. The Sufferer (album) diverged into too much genericism in my eyes, with only But Tonight We Dance as the really stand out track.
Needless to say they have never delved into 'bad' territory and I will be seeing them live at my University in March 09, as well as buying the new album when it comes out soon, but I'm not really holding out for anything spellbound.