So this is more of a general question that I'm not sure is easy to answer, so I might have to ask from 2 angles.
As a reader, are you put off from leaving a comment if the author has the option to manually approve all comments turned on?
As a reader, do you trust comments that are on a work less if moderation is on?
As a writer, do you find you have less comments if you have moderation on than if you have it open for anyone to comment?
The context here is I use comment moderation but allow guests to comment. So I manually approve any comments through my inbox, almost entirely because I feel safer that way. I started doing so after ending an online friendship with someone who knows my main user ID as well as the one I use for spicy fic - and I'm not comfortable having everyone know those 2 people are the same person. Particularly because close friends and family know my main ID and I don't really need them knowing everything I write about, for my comfort and theirs.
So I have never had a negative comment, hate comment, and have never rejected anything that has been submitted. But I am wondering if having that option there is making the comments I do have look like I've only cherrypicked nice things to let through or if it's putting people off saying anything at all, because I really do love comments on my works they let me know I've reached someone. I'm not sure if I want to turn off moderation, because it is a little comfort buffer, I just can't help but overthink everything.
Comments are completely different than reviews.
I don't look at comments to check opinion on fics, because I know 99% of times, people comment only if they enjoy the fic.
A comment is not meant to be a review for other readers: it's a way if contacting the author and telling them what you feel. If you don't like the fic, the right thing is not to comment. If you feel like there is constructive criticism to be given... the writer can decide if they like it or not. Seeing someone give constructive criticism on a fic doesnt change my thoughts on it
So I don't feel suspicious or anything if they have moderation.