I thought is was brave of Kurzweil to do that. Things like these are usually done by people not related to the industry. We have people come up with comparisons of samples using the same midi file to trigger them.
What Joel is saying, I believe, is why Kurzweil is doing it. To me, many of their patches do not stand out compared to the others - but then we know from all previous discussions that these things are subjective and people have different preferences. But I think they are brave nevertheless, and it's a useful site for comparisons. Though I'm not sure if it will help Kurzweil at all! They may be shooting themselves in their feet.
Still, it is a very helpful site for us consumers.