I don't see why someone should nessecarily be judged by their "accomplishements." Accomplishments are all relative.
It's already been said that some judges barely even consider the rider and skill level, and soley judge based off the horse and pedigree.
Also, not all people have an interest in showing - but that doesn't mean they don't know their stuff. Someone could ride just as well as any Gold medalist out there, but just not be interested in showing. Not everyone wants to deal with the politics of the show world, or the cost.
I played very serious competive volleyball in highschool. During the school year, I learned from the hired Coaches and staff that were available. During the off season, I trained on a team that was coached by a Bronze Medalist volleyball player. You know what? In the end, they all knew the same exact amount about volleyball. While one had the "accomplishments" of the olympics, the others were just as good as teaching as she was. They, however, just had no interest in being an Olympic athlete - their lives just didn't take the same path.
With that being said, I would train with a trainer that made me feel comfortable, let me enjoy my time riding, and allowed to move as high as I liked -or just plod around the arena every lesson for years to come. After all, I am paying for their service.
Awards and ribbons are nice, of course, but I wounldn't discount someone just because they didn't show an interest in that lifestyle. Doesn't mean they can't help direct someone else to the proper means it takes to get to GP level, or even an Olympic medal.