The one thing I find really painful is when I want a localized search like searching for "[chain resturant name] grubhub" and I get results half way across the country. Other than that it's great.
Example: if I search DDG for "Worcester" (a significant city near my home in south-central England), 28 of the top 30 results are Worcester, Massachusetts.
There is a toggle at the top of the page where I can choose "United Kingdom". That fixes it. But the default should be "worldwide" or "localised by IP address", not "US".
Or, put another way: does "[chain name] grubhub [zipcode]" still do what you are describing?
Heh, as one might expect, "there's a bang for that" which will save you two characters: https://duckduckgo.com/bang?q=grubhub