We need to remember. The number of unreviewed sites has become so overwhelming that some editors are simply chossing to power delete entire categories of submissions. I've been an editor for over two years, and I know the feeling that I get when I enter a category with 300 unreviewed. Frankly, my inclination is often to simply close my browser. I know I'm not alone.
Many submitters submit to the wrong category.
Okay, so they aren't as experienced as we are. There really ARE unreviewed from that date. Our descriptions are being whittled down to such a small stream of unhelpful words that in many cases, some searches no longer pull up relevant results. And we're not the only ones who are discussing that fact in our forums. It's mentioned all over the Internet.