DDG as a search engine really does suck, but as a ui for other engines it's excellent. I like it on my phone in particular because I can pull things up faster and save data by not going to multiple pages for specific searches. Examples:

!s - start page, a google proxy !yt - youtube search !w - wikipedia etc.

Almost all I use I just figured out because it's obvious. !az = amazon, !ebay = ebay, etc. Usually just guessing gets me there 90% of the time, and then I can learn to use it again.

But again, that's just my workflow, not for everyone if you don't care if you use google for 99% of your searches.