I think they are referring to how she holds the sword and how she swings it, not how well she kills things with it...
It doesn't really matter to me, but I'm a novice when it comes to sword use. I actually just bought some practice swords a few months ago and have been watching some videos, and practicing a little with friends. I didn't buy them because of this show either (or any show for that matter). I've just always been fascinated by weapons, mainly guns, but lately I've started buying other types (compound/recurve bows, crossbows, throwing knives, etc) and teaching myself how to use them properly...