This question already has an answer here:
RE: Take advice OF or FROM (the comment from Jim).
More than any other Stack I use, English.SE users have the habit of answering questions in comments. I've seen a lot of them over the time I've browsed this stack, the example from Jim, cited above, is just one example. I've seen it done by new users and veteran users alike.
A common habit is to not answer the question when someone has fundamentally already answered it in a comment. Regrettably, this is a disservice to the entire community as I believe comments are not equal to answers when it comes to search engines.
What is the preferred behavior when other users find these pseudo-answers that can't be downvoted, edited, flagged for quality by the community, or commented upon without cluttering up the question comment chain? Should we flag them for moderator attention (or another reason)? or should we ignore them?