You know that for a fact? That they have no experience with judging skiers in slopestyle?
It's not a crap shoot, I watched and I think I did pretty well with placing the runs, now why is that?
Most every kid I know that goes to these comps, goes to have fun, hang out with friends, maybe learn some new tricks, watch what the other kids are doing, cheer for their friends and try to throw down to impress their friends first, to place or win, second, correct?
If you are going to one of these events to try and place your best, doesn't it make sense to find out what the judges are looking for and what they are not? Otherwise why go?
Someone in the know correct me if I am wrong here. They judged on Amplitude, difficulty, overall impression, cleanliness of the trick.  Go big and deep with a switched ,spinning, grabbed, landed clean and it scores well.  Big Floaty stylish rodeo 5's don't score as well but are a crowd pleaser.
The ironic part of this is that those who were "robbed" are more than capable of doing the spinny things all one direction, but don't feel they are as "sick" as a trick. I wonder, if they had a better idea of what the judges were looking for, would they have still thrown the same run?
Don't get me wrong in all of this, I love the stylish tricks more so than 9's and 10's which are too fast for me to even see what they are doing in the air. I wouldn't have wanted to be a judge in that event. Everyone was looking so good.
My point is, 
In My Opinion - if you are going to a comp to win, then pay attention to what the judges want to see, don't complain later.  For example: sort of jokingly....  Old guys in bibs= USSA regimented all tech, little style  -   Scruffy young guys with pants down low = style, xtra points for XXXL, double points if 6 or more inches of your boxers show 

)
peace