Coming as a part of iOS 6, the Apple Maps app has received a lot of for good reason. Out of the gate, Apple's replacement for the Google-powered Maps app in iOS 5 has a lot of problems. Simply put, this app is not an upgrade over the last version of Maps.
One feature that many people have been waiting for on iOS devices is now here in Apple Maps: turn-by-turn directions with voice. Using the Siri assistant as its voice, the app in our testing on the streets of San Francisco. It delivered us to the place we wanted to go, and the voice directions gave us plenty of time for turns with few problems. The app had some hiccups when it came to rerouting, attempting to send us back to our original path rather than giving us a route on the new direction we were traveling (though it corrected itself soon after). It also had a problem with the difference between two contiguous streets with slightly different names (e.g. Broadway and West Broadway) -- a small difference, but important when you're traveling in a new city. Still, the turn-by-turn directions performed well overall, but that's not all there is to a mapping app.