Rammstein is cool because:
• Band members using head-mounted flamethrowers while singing/playing
• Till Lindemann singing an entire song while on fire
• Simulated sodomy and a giant custard-squirting dildo
• Exploding drumsticks, drums, microphones and boots
• Flake Lorenz being roasted in a giant cauldron by a flamethrower-wielding Lindemann
• Rockets fired along cables strung above the audience
• Band members surfing the crowd in a rubber dinghy
The Du Hast explanation:
http://en.wikipedia.org/wiki/Du_Hast