It makes me wonder a bit to see that DS is mentioned more than once as one of the buttom 3 sides to the TRD... We should feel blessed that the DS outcome normally is below or around 25% - It can be spotted right away and after surgery the pups can look forward to a long healthy life.
On the opposite dogs with severe DS its not discovered till later and the prognose of a good dog life can be very slim as there is no cure as such to make them 100% healthy again.
Or dogs with eyeproblems that go blind at a relatively young age ...
All in all i think DS is a problem YES!! no doubt about it but not really an issue that ill list as a problem to the breed.
My opinion on best and worst features:
Best:
Adaptability
Size
"Primitive dog" Behavior
Worst:
Agression /territorial instinct
Speed
Extremely well developed doglanguage. (Most other breeds are way rougher in their language and may provoke a situation without intending to, and thereby trigger agression)
ITT