He seems to be against one of the art styles that reio uses for some reason.
Edit: Apparently he's a Test Janitor.
Further Edits: @Wypatroszony I had just assumed you were some random guy because I couldn't actually tell who was flagging. I had also just picked one of the images that were flagged at random to put a comment on. Admittedly, I never actually looked further than the thumbnail.
@Armacalic: No, it is not good enough. Not from someone who is unaffected by the queue in the first place. This (and 30 others) is just sent in for a review (or should I say, a "view"?) and you people make it seem like, "hoo bad Wypatroszony wants toohoo out". If "artist style" is bad, then it should be improved by the artist him/herself, not defended by the users because it's a "style", just FYI. edit: @Archangel0891: Well, not by me. Nor by at least 3 other Janitors. Oh yes, don't forget to vote down an explanation.
Popular things get their standard lowered. So do cute things, and others that are easy to get empathy towards. Danbooru is full of pictures subpar that were approved long ago, or got bypass uploaded by contributors. Maybe some were just because it belongs to "X" series.
Sometimes, people flag things because they don't like it, even if the art is better than others post #1237656 is an example, of that kind of flagging, when the art is better than many things here, but it's "disgusting" so it gets flagged.
I have 2-3 pictures of One piece that never got approved or anything, just because time limit, but touhou it's almost instant.
That's just how it is.
Though I only try to upload good quality overall posts. This one, has nothing special, personally I wouldn't have uploaded it. I always try to think, if I would like the quality of the drawings, even if I didn't knew where is it from.