I haven't in ages. At this point in time I think "what's the point? by the time this gets dealt with, another thousand rule-breakers will be uploaded" All I would be doing is trying to scoop out a raging flood torrent with a bucket
Hmm. Your comment got me thinking. There really should be some sort of better system implemented for helping people put stuff in the right categories. But who am I to think of a brilliant new idea when admin hasn't yet? I shall contemplate this nonetheless.
Usually I report copyright infringements and stolen or traced work. I don't believe in censorship, so I don't report things for not having a mature content tag. And rarely, but occasionally I report a misplaced deviation, but that really has to be a case where I feel like the user completely and utterly misplaced it.
In any case, I simply report, and move on, commenting or drawing attention to it only creates more problems and can slow down the process of removing or fixing the problem.