I am a conscientious reviewer, and the conduct of some of my fellow reviewers, especially in the suggested edit queue, MAKES MY SOUL BURN WITH FIERY HATRED is sometimes imperfect and could be improved by giving them some gentle pointers.
Currently, the only way I can offer such pointers is to either flag for a mod to talk to them (wasting their time, which is precious) or create publicly visible noise by commenting on one of their posts. I am usually unwilling to do either of these things, even faced with CRASS IDIOCY BY WORTHLESS MORONS WHO DO NOT DESERVE TO EXIST review outcomes that I am certain are wrong and harm the site.
Could we add comments on reviews, visible to all reviewers and notifying all previous reviewers? I would like this feature both so that I can point out in advance issues that I fear incoming reviewers may miss (like plagiarism in tag wikiswiki edits, which makes up 90% of tag wiki edits I review, many of which still get approved), and so that when I see somebody make a bad review decision I can WISH PAINFUL DEATH UPON EVERYONE THEY HAVE EVER LOVED advise them on why I think their choice was incorrect and hopefully help them avoid making the same errors in future.