I am so disappointed with DDG recently, it has adopted Google's strategy of returning searches that have nothing to do with your query if not enough results were found [0], and dialed it up to 11. If "I" "don't" "put" "each" "word" "in" "quotes," the results I get have nothing to do with my search... but if I do that (apart from the inconvenience of it all) it means (presumably?) that stemming isn't done on the search terms.
Maybe I'm old school, but I expect search results to match the search terms. Fuzzy matching (stemming, synonyms) is an added bonus, but silently dropping words which don't appear is decidedly not. Moreover, a search result returning "only" two results should be taken as a good thing for someone with confidence in their dataset (DDG naturally doesn't have that, because their coverage is far from 100% of the web) - it means the search terms were extremely precise and the results are highly relevant, with irrelevant results filtered out. Decreasing the signal-to-noise ratio by willfully ignoring my search terms may increase the quantity of search results but - and I don't know about you - for me I don't care about quantity and would choose relevance as the more appropriate metric to benchmark against.
(All that said, I still use DDG as my main search engine even if I am turning to appending !g far more than I ever used to because I firmly prefer DDG's respect for my privacy and person over Google's treatment of the same. But I'm disgruntled and, frankly, very disappointed. Sorry, @yegg!)
[0]: https://neosmart.net/blog/2016/on-the-growing-intentional-us...
Edit: actually the situation is even worse. DDG doesn't seem to even always respect "quoted" terms. Here's literally the first search I did after posting this [1]. The quoted term "CFF2" doesn't even appear in the majority of the results DDG pulls in - not just not in the page summary displayed, but literally not on the result page at all. For comparison, here's the Google equivalent:
[1]: https://duckduckgo.com/?q=windows+10+%22cff2%22&t=ffab&ia=we... [2]: https://www.google.com/search?hl=en&q=windows%2010%20%22cff2...