What's great w/ DDG is if you want a google image search, you append !gi bing images !bi and !g for redirecting to Google !b for bing. !m for google maps. So basically you give a small guy a chance and it's decent enough. When it isn't the shortcut is great for the big boys.
And for programming, Duck Duck Go is the best because you append !so and it takes you to stackoverflow. Google values SO scrapers higher than SO.
That said, if you don't learn the shortcuts, you are missing out.
Also, after listening to a talk by Stoyan Stefanov (it's on IT Conversations) I realized that what makes Google so useful subconsciously is their subsecond response time. This is my biggest problem w/ ddg.
That said, I went to a meetup tonight by an Xoogler. He was mentioning that they have an internal query tool that will query a trillion records in a second. I wonder if Bing has the same...