It's unrealistic. No one wants arcade games when they are deeply involved in the sport. It's almost an insult to the sport. I can understand if snowboarding games had been beat to death and they introduced a new arcade style to refresh the genre, but they are just doing complete opposite and making the genre more bland.
It's not an insult to the sport any more than NBA Jam is an insult to basketball or Wipeout is an insult to racing... SSX is a series that has always been about over the top arcade action over realism. It's pretty ridiculous to read into it any more than that. If you want a realistic video game interpretation of snowboarding than you should look into the SNOW project (snowthegame.com) because SSX is NOT it and has never tried to be.