The results seem perfectly usable to me, sorry your favorite sites are not top ranking[0]. Care to explain why you think DDG is explicitly filtering them?
As for "perfectly usable", mountaindragon (result 2) and codesinhtml.com (result 3) are atrocious. And makemyownwebpage.com (result 10 or so) looks like a homepage from the 90s.
I think the issue is that DDG is getting crappy results from yandex, then filtering out the good sites to make the results even worse. Weird :)