Why are network time protocol amplification attacks more disruptive that other DDoS attacks?

Earlier this week, there was a DDoS attack on a Cloudflare customer that reached 400 gigabits per second and actually slowed network traffic across Europe. Apparently, it was a network time protocol amplification attack. What makes this type of attack so much more disruptive than other types of DDoS attacks?

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Story added 12. February 2014, content source with full text you can find at link above.