Google has one killer feature: It (barely, but) understands. It can find sentences that use different structure but meaning is similar. It can find result using synonyms instead of the original words. And so on. Google also understands simple plain language questions ("how do i do ... on ford mondeo mk4" works perfectly - but only Google can do that). It is even able to detect irrelevant results - e.g. it really filters just MK4 mondeos when I am looking for something, but I also had MK3 and putting MK3 into the query really did filter MK4 results away. I never had such success and productivity with any other search engine, and I really tried to like DuckDuckGo.