I can depend on what you want from things. I mean I know that sounds weird, that being depressed is a good thing, it's not the way I would choose to be. If mere happiness is your ultimate goal then yeah by definition you would see depressive as undesirable, much as somepony who values selflessness would view a low 'intimate' score as undesirable. To me there is more to being 'a good human' than self-contentedness. Remember that traits are just traits and you can spin them however you want really. For example you could say high vital people are arrogant, over confident, lazy, etc.
So I suppose I should list so ways that being depressive could be 'good'. In a casual sense you can look at people who have reach notoriety and fame as depressives. Plath being the provided example, but I would wager a lot of others, Bukowski, Cobain etc.
It could also be said that neurotic people have a bleaker, but more accurate view of the world, I have seen studies which suggest depressed people are better able to accurately estimate they degree of control they have over events. While non-depressed individuals on the other hand tend to over estimate how much control they have. So the argument could be made that depressed people have a more realistic point of view.
Many studies also link people prone to anxiety as better able to detect and process negative or threatening stimuli compared to controls. For all their worrying such people may be right in their worries.
Sure, a couple of studies doesn't make for gospel, but I have also seen studies suggesting happy people tend to be more gullible and other negative traits. So as I first said, it's all what you make of it really. To me being 'a good human' is more about playing your strengths and mitigating your weaknesses.