This isn't a question of comment-answer policy. It's about users who feel the need to answer many questions in comments. One such user is compulsive about it lately, often posting the first comment on many questions. I've probably flagged hundreds from this user alone, and I've attempted to get moderator attention to stifle the problem. It continues, and sometimes my flags are even declined.
What are moderators doing to minimize this behavior? What should be done? It's a hassle for those of us who attempt to keep the site flotsam-free. Answers do not belong in comments. Neither do opinion or guesses posted as a pseudo-answers.