Heh, I would complain by image resolution rather than brightness. Somehow I don't believe it's flagger's fault to express an opinion, but the review system that is flawed.
It's like one unique moderator does all the voting on different accounts. I have yet to see moderators expressing different opinions, not all unapproving the same post at the same time just because it's flagged... or maybe if you do otherwise you stop being a moderator.
Moderators would delete things outright. This is just flagging, which means nothing unless the janitors agree. Someone going nuts with flags isn't a real problem, since it does little on its own.
It's not democratic. If a single approver likes a picture, they have the power to approve it all on their own. Unless they already approved it, and it got flagged again, also known as "asking for a second opinion."
(I say "approver" instead of "mod" because some users have approval powers, but not the Moderator or Janitor user level.)
Also, nothing is manually deleted unless it clearly violates the rules (for example, things that aren't anime-related at all, like photos of American porn actresses). Almost everything that gets deleted, gets deleted automatically by the site after 3 days of no approvers liking it enough to approve it.
about:mod queue is a little out-of-date, but still a good read if you want to know more.
All I'm saying is the review system doesn't look democratic, because always ALWAYS the number of dislikes is the same as the number of reviewers.
They don't "dislike" a post. (Well, they might downvote it, but that's not what that measures.) That simply means that they loaded the page for this image, and didn't hit "approve". There can be any number of reasons for this, going up to simply suddenly having something else to do and leaving the room before making a judgement one way or the other.
The deletion text states that an image is deleted because 'at least 10 moderators looked at it, but didn't approve', but I often find it's more like only one or two guys looked at something, and things that are of less-popular copyrights get little attention.