1) The results I get in DDG are the same results I get in Bing - which means that DDG is for me just a shell around Bing. And even though DDG is not sending to Bing any cookies with my ID, well, being a power user I can and do use the Incognito/Private mode of my browser. Furthermore, your interests can function like a digital fingerprint, so if Google or Microsoft want to identify you without any cookie whatsoever, they can and DDG does not help.
And the bang shortcuts of DDG are also provided by my browser. I mean, if I'm concerned with privacy, why in the world would I want to send my Google searches to DDG's servers?
2) People saying that DDG's search results are just as good are probably living in the US. Outside of the US, like in Europe, non-Google search results get to be like really, really bad ;-)