I've looked at the tests and I'm not sure that someone just "looking pretty" could get away with a good score anymore than someone in a regular test...I honestly thought they might challenge me a bit more. I for one would most certainly go for this class. It will be interesting to see my results.
I know in my experience that having a horse with better movement definitely affects your score for the better. I used to ride this other mare whos movement was lacking...she just naturally didn't have much athletic talent. Getting good scores on her was a challenge even though she was a terrific mare who was excellent at showing and totally a schoolmaster. However, I can get on my current boy and just naturally get better scores...he has better quality gaits.
I think that really the point of these tests is to put riders on more of an even playing field...since they are don't give, "extra credit for the horse's gaits, impulsion and submission,"
Now of course I agree that a horse with bigger movement is harder to ride to...but a horse that is easier to ride because they aren't as correct in their movement will get fewer points.
But those are just my thoughts...