I am a DDG user for 4 years or so, and had very few quality problems. When I am not happy with results, I check Google, too. Most of the time, though, Google returns similar results.
I hope to get here. I've been using DDG since the start of the year, and I'm thinking of switching back to Google. The results for me are off the mark to such a degree that I use the `!g` more times than not. Even if DDG has the result on the first page, it's never at the top like Google often is.