I have tried to use DDG several times, but Google is just better. For instance, if you search 'Serena Williams' on Google you see her recent US Open results nicely presented. Similarly, if you search for GOOG (on Chromium-based browsers [1]) you get a stock chart. The point is, Google saves me time due to the domain-specific customization they've done.
The bigger issue for me is that if DDG becomes popular, they might chart a path similar to Google in terms of privacy. It's another ad supported search engine after all.
[1]: They show dumber results on Firefox and should be in anti-trust territory, but that's a different discussion.