Bad DDG results are a myth at this point. It was true a couple of years ago. But they’ve improved a lot and last few months I rarely use google as a fallback.
In that case I fallback to Google which is usually helpful even though I have the feeling that it's getting less good.
In the end, my default search engine is becoming Wikipedia... (Mostly kidding, of course, even though I rely to Wikipedia for an increasing number of searches.)