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Consider the following trail (question Unrecognized rule error, but you'll need 10K rep to see what I'm talking about since the non-answer is deleted):
Does the offender learn from the repetition, or would it be sufficient to give the canned message just once?
Note: there is no dispute that it was 'not an answer'; the only issue is the same message appearing 5 times.
Per the comments:
Okay, enough bold now.
There is only ever need for one canned comment per post. Adding yet another (canned) comment to a post is rude and often either offends or extremely embarrasses the OP/Answerer.
If you think you have something constructive to add not mentioned in a previous comment go ahead and add it, but make it personal and not canned. This makes the OP/Answerer feel more welcomed.
jonsca mentioned in a comment that this might be a result of yesterday's low quality posts 404 bug. I think this is highly likely seeing duplicate comments from the same people.
Like Seth says: No. Whether reviewing or in any other situation, once a comment has been posted to say something, additional comments that say the same thing are unconstructive and bad.
Here are some additional reasons why the answer is no:
Comments that don't add anything constructive should not exist.
Comments that just repeat information elsewhere teach the bad lesson that pointless comments are okay or even good. Reviewers should model good standards of behavior for their communities.
Multiple comments saying the same thing make reviewers look incompetent. (This is not an illusion--when we do that, we are acting incompetently.) This should be expected to decrease the likelihood that people will take review comments seriously, not increase it.
Seth talks about unnecessarily embarrassing the author of the post being commented on. And that's one of the many valid reasons not to post more than one comment that conveys the same information (whether or not it's worded exactly the same). But I think it's even more embarrassing to the people posting the repeated comments. It sends the message that they don't know how to use the site (or at least the review system).
As a corollary, one comment with upvotes from others who would have posted it is much more powerful than a whole bunch of comments.
When a post shouldn't exist, it should take up as little space as possible. Often it's worth it to increase that space slightly to comment clarifying why it shouldn't exist and how to use the site. It's never worth it to make the post take up more space by adding more comments that say the same thing.
These repeated comments stick around after the posts themselves are deleted, to distract and upset 10k users. That "it's going away soon" is no reason to get sloppy.
Commenting is not a way of voting for why a post should be deleted. The default action is to leave no comment at all. The only consequence of leaving a review comment is that you've left the comment. I think most repeated review comments exist because people don't understand the purpose of the comment dialog in review.
People sometimes say, "The system left it for me." I say, "Take some responsibility." The default is not to comment at all. If you choose a comment, those are your words, even though they've been said by others before. When they've been said by others in the same place, don't say them again in that place.
Accidental repeated comments are easily fixed, so they should be. If you accidentally leave a review comment when another one saying the same thing has been left, you can and should fix this by deleting the comment. These comments are listed in your comment history (in the Activity tab of your profile), just like any comments, because they are no different from any other comments.
If someone else leaves a review comment after yours that conveys the same information as yours, they did the wrong thing, but the simplest, fastest, and most efficient solution is still to remove your own. It's not about who left a visible comment. Your review still counted.
Related on Meta.AU: http://meta.askubuntu.com/questions/4219/psa-when-reviewing-dont-post-duplicate-and-near-duplicate-comments
