I dropped google a couple weeks ago as my default search system in favor of duckduckgo.com. The reason was that the results for technical terms started getting more "fuzzy" (+ operator was dropped and no matter what I couldn't force it to limit results to only things that contained what I wanted)
Now I am even more hesitant to use it. Google search has been a winner due to its clean layout and generally not being biased.
It looks like that era is over.
Real-Life Examples Of How Google's "Search Plus" Pushes Google+ Over Relevancy