Recently on biology SE there was a question evolutionary biology which generated a lot of interest. Often these sorts of questions attract a lot of opinionated and flawed answers, and answers that don't actually (attempt) to answer the question. Unfortunately they generally get well upvoted because there are not enough people capable of finding the flaws or understanding the question properly*, and they are still interesting.
Essentially the question asks "Previously I thought that evolution was about improvement, but someone corrected me - it is not actually about improvement. So why do we see so much improvement?" and a correct answer would show that, first of all, evolution is a process of change, and the reason we see so much improvement (adaptation) is because of selection, a mechanism of evolution. In other words, selection, not evolution, explains the frequency of improvement.
Many answers came (and went) that were wrong or long opinion pieces. Some have persisted though, and in fact there is an accepted answer with a score of 52 (54 up, 2 down). That answer doesn't, in my opinion**, answer the question. It explains that selection doesn't necessarily lead to increased complexity, which is another issue entirely. I think it has got a lot of upvotes because it is in an interesting post and generally well written, but it would answer the question "Does evolution always increase organismal complexity?"
Would it be correct to flag answers, which have been heavily upvoted and accepted, as not an answer? Even though it is well received, and may be interesting to read, it does not even attempt to answer the question.
I've read some posts on meta about how to deal with accepted answers (such as this, a question where it is possible to clearly define a correct asnwer) but it's a bit different with such highly upvoted answers and questions which may garner some opinion in the answers, and whether an answer does indeed answer the question is less clear cut, so I'm unsure what to do. I would really appreciate some guidance - I'm not comfortable leaving such answers on a subject I care about, evolution is subject to a lot of misconceptions in the public and such answers won't help in stopping that. I have tried downvoting and commenting on the post but with no success, my comment saying explaining why I think the answer does not answer the question is multiple upvoted.
* Understanding the true nature of the question requires a deep understanding of the subject because, in large parts, it is down to subtle differences in two processes.
** Opinions formed by doing a PhD in evolutionary biology studying the process of adaptation