Interesting, like I said I've never seen a country that isn't shockingly good.

I travelled extensively in 35 African countries - including a bunch you wouldn't expect to get good data for like The DRC, Burundi, Sudan, Mali, Gambia, Djibouti, Ethiopia, etc. As well as Belgium, France, Spain, Canada, USA

I lived for one year in Cambodia. Major roads are mapped, so you can generally navigate, but lots of small streets and roads are missing. Also, even in the capital most of the buildings are not mapped. I've mapped a few buildings and streets but didn't have time to do a lot. Also, it's incredibly hard for a foreigner that doesn't know Khmer language.

Mongolia is poorly mapped on all maps, not just OSM. But OSM coverage was the poorest about one year ago. Don't know if it is improved since then.

It's pretty bad in my city in the U.S., or at least was a few years ago when I last tried to volunteer some editing time. Guess I should look again.

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.

You can make it better!

I have tried. But it's very difficult if you're not local.