On the Stack Exchange sites, the "Unanswered" section shows questions with no upvoted answers. Biostar's "Unanswered" section only shows questions having no answers at all. I prefer the former, but I'm not sure what others think. I do think it's a worthwhile discussion if TPTB at Biostar would consider changing this based on community feedback.
At the risk of getting into a mind-numbing semantic debate, "unanswered" doesn't necessarily mean no answers. If I ask "how do I replace the timing belt on a Volvo 1988 240DL?", and someone answers "potatoes," I think it's safe to say that my question remains unanswered. But I know what you mean about a lot of questions having acceptable answers which are not upvoted.
I'd argue that "unanswered" in our context means "no responses". Hence "potatoes" is an answer. Not a good answer, not one that you want, but it is a response.