That's true for me too. Many of my Google results are buried in "fresh" blogspam, none of which contains anything either original or interesting.
This may be the result of good search and Sturgeon's law. https://en.wikipedia.org/wiki/Sturgeon%27s_law
If so, the real problem is that Google search is incapable of identifying content by quality. As a result, the more Google searches, the more crap it finds, and the worse the results become.
Refutations of this idle hypothesis welcome ;-)
Don't see the innovation with Ad Words: as _every_ small company can use it, you fight towards the bottom and sometimes against cowards instead for quality which an independent non-ad-financed search engine would much better reveal.