From a quick test, the search engine is pretty bland and unexciting for normal queries, but it motivates you to make different types of queries, where it does have interesting results.
For instance, just searching for "china" isn't anything interesting, but the site is begging for you to do "china /tech" instead, where it is interesting (and also traffic in China, Maine, but nobody's perfect).
Being able to limit your search results to e.g. "/liberal" is one of those powers I really don't trust people to use responsibly. Not that it's doing anything 99% of human brains don't do automatically, but still.
