In my attempt to switch over to DGG, I found its programming-related search results to be particularly bad. Searching DDG would give relevant results of questionable quality, or completely unrelated results (like links to tennis racket information when searching for help with the Racket programming language). The same search on Google would return relevant Stackoverflow threads and blogs which seemed more reputable.

I still use DDG about half of the time, and can't think of any egregious examples I've encountered recently. Perhaps they've gotten better, or I've learned to write better search queries.