I've been using DDG for a while now, my biggest if not only concern with DDG is local specific events or chronologically close events.

If my search string has or shares close proximity to either an event in the past or a local event else where of a similar name, I rarely find my results.

For instance during the Australian Election recently, if I searched for Australian Election I was never returned results for the election occurring at that time (literally). Instead I was returned the results of the prior election, I assume the prior Australian Election has a higher search ranking than the election happening on that day.

NB: Maybe I need to get more Australian's on DDG...

Of course my searching habits have changed to counter act this, now I counter act this by adding either/or/both a locale and datetime and it nearly always works. I still have to use the !g for more specific searches but I say DDG covers 90% of my use cases now.

Edit: a lot, my post read like shit.