When I search for something on DDG, I generally find one or two good results somewhere in the first set and all the rest are spammy/junk sites that repost content from other larger sites or just poor quality results.

DDG also doesn't understand context or acronyms, like MoP. I work for a gaming site, so my example is gaming related.

Google knows when I search for "mop legendary" I am looking for information relating to a legendary item in the Mists of Pandaria expansion for World of Warcraft. DDG doesn't make that connection of MoP -> Mists of Pandaria. I do get some amusing results like this though: http://www.buy.com/th/swiss-legend-diamond-mop.html