I pretty much agree with everyone here - believe it or not.
The reason we can't get any "honest" judgings in the driving classes is b/c the judges pick what they prefer. A Quarter horse judge is going to pick a horse that looks like a Quarter horse (this happens in halter too), a Morgan judge is going to pick a horse that moves more like a Morgan. And every breed is different. The root of the problem is that there are no Miniature judges. 75% of the judges we have primarily judge other breeds and do minis "on the side." They just want another breed to add to their credentials. And when they judge the minis, they can't set that aside and judge them as Minis. Also, I think when judges see "Country" (and let's face it, most of them probably don't REALLY read the rule book or pay attention in seminars) they think , "Aawww, how cute, flowery dresses, straw hats, and a wooden wheel cart."
We've (my family) had a problem with the whole Country vs Single Pleasure debate for a LONG time now. I had a mare I showed for a long time and pretty much stopped showing her b/c she was in between. She had attitude, could set up and wear the harness (and I mean "wear the harness" in the definition saddle horse people do, not literally), but she didn't have quite the motion the Single horses did. So, the judges didn't like her in CP, b/c she didn't poke along with her nose out and on the ground (and that's what they expect), and didn't like her in SP b/c she didn't have motion. So what do you do??
I personally like what the saddle breeds do and would model my ideal off that (that's our background). There would be have Park classes - breaking level in the knee, HOT, almost impossible to get in a mini (they're just not built that way). Then you have the Open or in our case Single Pleasure - level knee action, high head set, Hot. Then there would be Classic Pleasure, natural motion, not as hot, but still a show horse. Then, Country Pleasure - more flat knee, laid back, lower, more natural headset.
Anyway, that's my opnion and my tirade on the subject.
Oh, and one more thing... If you're showing in harness, PLEASE clean your harness and polish your brass, don't forget, turnout is part of the equation.