This isn't a reply to anyone in particular, but objectively, a lot of the posts that do get flagged are flawed. There are different degrees of leniency that different people have, for many reasons, and we have to make a way to respect those two with a better compromise.
Recently after a set of undeletions I did, someone went about flagging 10 or so of them. I wasn't worried about that as a bug causing them to immediately enter deletion had me more concerned. The thing I wonder about is, if one decides that an image does not represent the archive on an individual basis, and then someone else approves the image afterward, it's losing us energy, and we could probably prevent this recurring cycle, but how should we?
I don't blame anyone for thinking perhaps an image that was deleted 5 years ago should stay deleted, if it isn't something particularly special. What I'm getting out of this is that perhaps the idea that an image is flagged in more than a few instances without a prior notice of the weak points of an image is creating more fights, when we could encourage the use of the comment system or a forum topic to head off these fights before they start. That's where my next few suggestions come in: Checkboxes for adding objective tags anonymously by approvers who don't feel an image is good enough and requires a second opinion, so that the images can be in a blacklist which separates those images out without needing flagging, and giving dissenting approvers a chance for images they do feel might belong to at least be given conditional acceptance.
As it is, we have a thread for deletion appeals, perhaps we should encourage approvers who feel that an image is flag worthy to more often use the detailed message part of the approver box and moderation queue more often to make some sort of declaration that an image is in their mind flag worthy. This might discourage at least some approvals and perhaps lead to fewer flags.
I also brought up a comment in a separate forum topic #13673 responding to Mikaeri, and I suggested that we use the tags perspective_warp, anatomical_distortion, and proportional_abberation to denote an objective tag that describes both accidental and intentional use of odd elements of physical design, including cartoon anatomy for obvious deviations from the norm. From reading the current thread, I'd take it a step further, and possibly allow approvers to mark for these things when selecting poor quality or no interest as a check box, adding the tags in a hidden manner, protecting those who use these tags the way we protect flaggers. Having more descriptive tags in general for flaws in images gets people thinking more specifically of whether it should be approved or not.
From there, we can start encouraging the use of blacklisting to extend to these tags, and save flagging for more egregious examples of poor work. If an image gets marked with a tag like anatomical_distortion, then it enters a blacklist region that those who do not want to see can avoid, while those who do not want the image deleted or who want to avoid having approval arguments can get the choice without bothering the first group. Then when an approver chooses it, they have it tagged already with these extra descriptors of image flaws so that a persons concerns were brought up before hand. If we already know an image is flawed, and it is approved, we can say that at the very least, someone had a word in edgewise.
For that reason, I think the poor quality mark could count as a proto flag, and in any subsequent flagging, it will be the first reason, and secondary flaggings will either have to back it, or bring up an original problem with the image which wasn't noted by the first.
I also wonder if perhaps we should use a thread to separately allow approvers to ask if an image will be given these cautionary tags or will be flagged if they go ahead with an undeletion. If deleted images are marked with more notice on why they were not approved, it means we reduce the problem of appeals on images that might not deserve them, and would give those who have images that do deserve consideration a chance to show their appeals have more substance.
Cutting down on both the demand for flags and appeals with objective tags to make the dividing line between approval and deletion will perhaps make this possible, and perhaps leaves us room for accommodating measures that satisfy both sides. I do see one possible flaw to this whole approach, which could be that some approvers might add objective quality tags which obviously don't belong, in which case I'd leave it to the moderator/admin levels to be able to remove these tags if contested. That said, I don't think this could be as easily abused since the point is to encourage the separating of the tagged out images for those who don't want to see art with them, and may perhaps reduce the issue of flag vandals.
Another side idea I'd suggest, is perhaps a moderator level tool (if it doesn't already exist) to allow mods/admins to invalidate single flags, reverting to the prior approver(or to the contributor) if the flag is found to be exceptionally frivolous, but this last idea is just an afterthought and perhaps just not worth it.