I did not finish watching all the DS9 episodes. In the DS9 episodes that I watched, Rom was portrayed as a loser. Not just in humans' eyes, but particularly in Ferengis' eyes. He was a poor businessman. He was a weak salary worker who was constantly bullied by his boss who was his own brother. I started to gain some respect for him in one of the episodes when he plucked up the courage to start a union. However, I was horrified to hear him quoting Karl Marx "Workers of the world. Unite!". Can you imagine the future leader of the ultimate capitalist species Ferengis quoting communist slogans? Later when Rom changed job, he had a low-sounding job title as some kind of maintenance engineer in the Federation. To make things worse, the Federation does not pay a salary as money does not exist in the Federation economy. Most unFerengi-like.
I am absolutely dumbfounded when my son told me Rom became Grand Nagus. It is really hard to imagine a junior worker with a lousy job title and a loser history rising up to become CEO of a big corporation. His story can be an inspiration to long-time losers. But how did he get there?