It's all about the spacey wah bass part, with cool guitar rhythms on the choruses (using the blues scale principal of heaviness). The drum sound is so snare-oriented in this whole album, like the mic was inside the drum, so the snare really fills up the mix and adds to the heaviness.
The slow beat gives de la Roche room to be a little more fluid on his speaking rhythms, with almost the feel of enjambment, if you're familiar with that poetic concept. In past albums, he spoke almost every word on the beat, in effect becoming another percussion instrument. His work on the final Rage album of original music saw him loosen up a little.