Sort of what like Bishop said, average skiing with no commentary will just be meh. It takes a lot of good skiing the make up for having no talking.
However if the skiers themselves do a bit of talking to the camera, it makes them way more relatable, and the edit more entertaining in general. That's why stuff like LTC is so good, it mixes skiing with nonskiing/commentary really well. All it takes is just 30 seconds to a minute of the skier talking about the day/trip/feature/whatever.