During the last year or two there have been many changes with Google pushing vertical integration, but in addition to identifying and verticalization, core relevance algorithms (in particular to combat spam) has not changed very recently. There have been a couple of tricky bits but when you consider how much more powerful Google grown, their approach to the core search was not so contradictory, as a few years back (without having to push more self promotion).
There have been some speculation about why Google has shown below and manual intervention, including:
anti-trust concerns as Google steps be guided vertically in self-promotion (and an endless well of financing for complaints, courtesy Microsoft) wanted to create more automated solutions, such as the Internet upspending scale significant resources struggle site hacking (theory "bigger fish to FRY")Matt Cutts recently did a blog post on the official blog of Google, which stressed, # 3 was indeed a big problem:
As we have increased our size and freshness in recent months, of course we are indexed very good content and some junk. In order to meet this challenge, we have recently redesigned document sorting level, which makes it harder to contain the page content to rank highly. Reclassify it is best to locate spam Web pages, individual, e.g. repeating contains words
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