I can't speak for others, but my disappointment is with the margin of improvement. I know that results often sucked back in 2001, but with 10 years of progress I would hope to get better results. In the case of "buy domain name" ( http://www.google.com/search?q=buy+domain+name ), 4 of the top 6 results I get are How To articles, not sources to buy domains. Google is trying to solve a hard problem, and I appreciate th…
Without having personal search switched on, they need to hedge their bets. (note: not having tried it I don't know how effective the personalized search is) In general these populist algorithms may tend to skew the results against techies, or those who 'know what they want', in favour of overall increase in perceived quality.
As far as I know there is a human component, and there is definitely significant weight these days towards CTR as determining quality. These would likely just reinforce the populist ranking factors.
One of the underlooked aspects of Google is the sidebar - using the 'fewer shopping sites' and time-based queries can be a huge help to relevance. I've for years used search modifiers (+, .., - etc.) in my initial queries with an expectation of what Google might expect. A search like "Buy Domain Names" still retains a lot of semantic ambiguity that their algorithm has to wrestle with. You have the tools to fix that yourself.
As such I tend to agree with Matt on this. We've just forgotten how bad it was.