I just drove 35,000 miles around the US this summer through about 30 states, and OSM had absolutely every single road, intersection and detail I could ever hope for perfectly mapped. I used it solely for navigation in a ton of places I've never been before, and it was brilliant.

What do you see lacking in your city?

Things may have changed, but two notable omissions at the time: a restaurant that had been there for 30+ years, and the post office closest to me.