Honestly, letting anyone self-publish is really the whole point of this platform. That has pros and cons, but it's the reason this site exists. It's true that it's hard to stand out in a field of almost 400,000 titles, but the problem is that there's no objective way to apply the quality filters you want. We already have the "featured" and "fresh" sections to showcase subjectively curated content - if you only want to view what the site operators think is the best content, those are the places to look.
I don't think having another level of curation for supposedly undesirable or "joke" projects would be beneficial. If some anonymous curator took something I had worked hard on and threw it in the trash pile where no one will ever see it, I would be pissed. Why would I continue publishing here after seeing my work treated that way?