Replying to Classification of a "good" Skier/Snowboarder

I really dont understand. In my opinion, if you can 360 or grind, your good enouph, but thats probobly because i'm on  a freestyle skiing website. My Parents always say things like, "wow look at him go, hes a really good skier" and yet I still dont understand. He looks like hes carving down a hill just like any other. As for snowboarders, the classifcation is usually completely different. You ask a snowboarder if there decent, they'll usually say something like "yeah, im ok". Instict is to ask "what can you do?"

So really, the question is, how would you define a "good" skier or snowboarder:
Carving down a hill?
Being able to ski Pow well?
Or hitting shit in the Park?

Im not really trying to compare skiing and snowboarding, im just trying to figure out how to define "good" for each one.