Traya, Exile, Nihilus, and Sion must be skilled swordsmen. I would say they are equal or even better than Maul in sword-fighting. And Maul's not that great. If Maul is a child in swordfighting compared to Tulak Hord, then Hord must be on par with Luke in swordfighting.
ESB, I agree that it makes sense. But one single quote that defines all of Hord doesn't mean it's literally ture.