This makes me wonder if there's a perception issue: many of the companies are doing very well and delivered solid presentations, so no one really looks "10x" ahead of the rest. Especially since each company gets only 2:30 and many share the same structure. "This is what we do. Look, we have awesome traction. And we're making a bunch of money. And our growth is very healthy. There's a big potential market to capture. And this is how we see ourselves changing the world." And on top of that, you don't get a very strong sense of product and user experience within that narrow timeframe, sitting in an audience of a few hundred.

My guess is that if the quality distribution was more like what an angel/vc sees outside of YC, it'd be more obvious that that there are some amazing companies in the W13 batch.