The Apple App Store likes to show reviews that are tied to a country, but at least for the ones I see Xcode sits at a proud 2.6 stars, with hundreds of 1 star reviews complaining about bugs and crashes.
Certainly reflects my experience as well. When the text editor of a development environment doesn't work right, I mean, shouldn't that be job number 1? Search google for "Xcode bugs", you'll see thread after thread of complaints.
I can find major complaints of bugs and crashes going all the way from 9 years ago to the latest Xcode release, no other development environment has this many complaints. It is by far the most buggy and crash prone development environment available today. People _happily_ pay for AppCode for a reason.