I'd guess it depends on your definition of "good". Good as in: texture? Bloom? Length? All of the above?
My judgement of coat is most likely different than people who do conformation, but I always check the skin first. Is the skin dry? Flaky? If so, it's going to affect the coat.
Is the coat shiny? Does it 'feel' right? Or is it oily, smelly, too coarse? I know some people say a golden's coat shouldn't be too silky either!
Does he have a full set of feathers/pants? Or are they stringy or thin? How's the ruff?
Ranger's coat was looking awful in October. He was sick right when he was blowing his coat and boy, was his coat ever affected by it. It had an oily feel, yet the skin was flaky, and his tail feathers were so thin. Lost the glossiness of his coat, too.
Now, his coat is back to feeling and looking glossy, the dry skin is getting under control (it's always so dry here and it takes a huge toll from summer to winter), and his tail feathers are finally growing out. Right now he's got 2 different lengths of tail feathers. But, Ranger is also never going to have a golden retriever coat. He doesn't have the undercoat for it so his tail and feathers are always going to be judged wanting when compared to a golden...which is why i go by how glossy his coat is, how it feels, and how his skin looks.