I started a thread about discussion last year, too. My feeling then and now is that we have a respectable number of reviews, but that reviewers are posting their individual opinions, not really discussing games with each other. https://intfiction.org/t/what-do-we-talk-about-when-we-talk-about-if/8514/1
I like your idea of organizing reviews by game, if only to juxtapose the reviews and invite participants to reply to discuss multiple reviews together.