DDG:
http://duckduckgo.com/?q=the+movie+where+evil+is+in+a+toaste...Time Bandits is #8
vs
https://www.google.com/#hl=en&output=search&q=the+mo...
First hit.
I realize it is in fashion to make bold claims that somehow Google destroyed its search in a monomaniacal pursuit of social, but a hyperbolic if not patently untrue story. Yes, the user interface has changed and gotten fancier and more cluttered with the introduction of toolbar and sidebar (that's been happening over years, prior to G+), but the actual organic results have not changed much at all except to improve on average, even if you take into account Search Plus Your World (which you can disable)
Shocking, but most people at Google do not work on G+, it is not the sole focus of the company, and the narrative that Google is simply dropping everything else to mindlessly chase Facebook is blogosphere fiction. There are over 30,000 employees and I would be surprised if even 2% of them worked on G+. Teams at Google are typically small and at any given time, people are working on a large number of projects. It's simply not Google's culture to mindlessly focus on a single unproven product to the detriment of others. If anything, Google is frequently criticized for doing too many new things at once, and that's what you get when you have a company run with engineering culture.
Google makes most of their money from Search and Ads. You can bet that they watch data from search quality and marketshare like a hawk, and if social was causing Google search to suck more and lose customers, you can bet they'd turn it off in a heartbeat. It's been said by some analysts that every 1% loss in search marketshare is $1 billion in revenue. Facebook isn't making that much money, and so from a cost-benefit analysis, sacrificing billions in search share revenue to try and gain social-search revenue doesn't sound rational.
It would thus be reasonable to assume, that any changes Google actually makes to core search are a) conservative b) subjected to a battery of scientific tests and c) as low risk as they can make them to their core business.
But the way you read things in the Blogosphere, Search has been radically altered. The evidence just isn't there.