A lot people is complaining about the missing cities, mistakes, low quality in the new iOS 6 Maps application. In fact, it’s a new app, it’s still a work in progress. I prefer to think about it as a Beta version, just to avoid my disappointment to grow.
If you want other people to test your app before releasing it in the app store, you can use the Ad-Hoc distribution system. It’s not well documented but it’s very easy to setup. Your beta testers and clients will be very happy because from now on they can just download the app from a link without the pain of connecting to iTunes, neither dealing with the app store. They can download the app directly from their devices.