The question, Are there alternatives to the GTD system?, recently got bumped back up to the top of the main page by a user who posted a spam/low quality answer. Here's the 2k+ only link to the deleted answer.
This question was asked in the site's early days and has acquired a lot of views, but it really doesn't represent the high quality that makes a good Q&A piece. The question asks for a list of alternatives based on a set of criteria that arguably isn't very clear. There's a pretty good chance that someone else will come across it from a Google search and try to post another non-answer or spam. Alternatively, they might get the wrong idea about the goals of the site and try to post a similarly-worded question.
What should ideally be done about this post?
Vote/flag to close it as primarily opinion based or unclear? Considering it's not an example of a good, on-topic question. Closing, but not deleting, would probably be best to prevent it from needlessly getting bumped again. This would still preserve the content and any inbound links to the site.
Leave it open, but Protect the question. Only people who have earned at least 10 reputation on this site can post additional answers to questions that are protected. What's more, this doesn't require 5 close voters or a moderator. Anyone with at least 3,500 reputation can protect this question.
Try to edit the answers and improve them. This would be tough to do without having a strong understanding of the actual value of each alternative in the answers. This still leaves a question that's very unclear, so it could also benefit from some editing. This is a lot of work, and there may very well be other areas where we could make strong improvements in less time.
It's worth having a discussion on this post, since it's sitting at the top of the active page right now for any visitors to see.