I've been using DDG with Firefox for about 2 years. I've been happy with this search engine most of the time and like that it doesn't report my usage but a number of things annoy me. ++
Most annoying: when at a site I've finished with, if I type in a new search in the upper right search slot and hit <ENTER>, I will get the results of a search WITHIN the site I want to leave. The search title for the results is: "(search item) site:(website last viewed)" Example: "edward site: whitepages.com". Here I've wanted to search for "edward" on the Web but DDG constrained the search to within my last site viewed, which here is "whitepages.com". After using (typed item) <ENTER> for decades for a search on the whole internet, this is assbackwards. If I want to do a site search, I will deliberately click the DDG site search symbol (which is a kind of bullseye) in the search slot. Oh, and this setting is NOT in the DDG settings options. I have complained to DDG without response, so I'm saying it here. ++
Next most annoying is setting a search which I know will give many hundreds of results and getting only a dozen or two. I almost feel censored (and the term typed was in no way something to censor). I often have to add more terms to get results. Usually, I want the search engine to help ME by providing too many results and letting me use these results to prompt edits or conditions to my search, as necessary. I did make sure that child protection setting in DDG was off.++
3rd most annoying thing is no hint as to how many results were returned. Sometimes it's very helpful to know that there were only 17 results, total. I might need to widen my scope. Or if there were 108,500 results, then I should narrow. DDG gives no hint to this. Am I looking at all there is when I scroll down 3 pages or a bottomless pit of results (like Facebook)? ++
I'll end there for now. I hope DuckDuckGo will improve as I do like it's look and feel MOST of the time.