Was Genghis Khan a good ruler?

It depends on one's perspective and values. Genghis Khan founded the Mongol Empire, which became the largest contiguous empire in world history. He was known for his military conquests and tactics, but also for his administration and laws, which promoted religious tolerance and trade. 

However, he was also responsible for widespread destruction and killing during his conquests. So, opinions on whether he was a good ruler vary.