This is true but not as true as I always hoped. The problem is that new courses often haven't generated enough interest yet. The fact is, however, that if your high quality review happens to be one of the first, it will tend to get more thumbs as the interest grows. Just don't expect to get more than one or two thumbs until months after you've reviewed a new course.
I'm not gold like you, but I'll start yakking anyway.
I think there's a lot of randomness involved, though the most important thing is volume. I'm not gold and it's mainly because I haven't written enough reviews. Nevertheless, I've reviewed enough courses (both widely known and just locally known) in different regions to know that the region makes a big difference, and that being an extreme top or extreme bottom kind of course will definitely get more votes. As far as getting unique votes goes, picking a few locally strong courses in various good regions seems like a good strategy. I currently live in the Pittsburgh area, which has that combination of quality and disc golf interest/community that a good quality review can garner some quantity votes.
Again, though, it's very random. Sometimes I'm surprised by how few votes a review gets, on what seems like a popular course in a good region. Other courses have surprised me by getting quite a few votes (for me that's something like 6 to 8) even though the course doesn't seem to have active interest, or I didn't think there was anything special about the review itself. In looking back, some of those may have included details that hadn't been mentioned before, or may have struck some kind of chord with locals.