Free? You sound like an Android user. I want polished apps. Not half baked and free. There's already free turn by turn for the iPhone now that are half baked. Integrating a half baked mapping system into a half baked voice system? Not exactly appealing. Not something that should be released.Yes it is better. Yes you can get turn by turn, but you have to pay for a decent one. This is free and integrated, plus voice controlled by Siri is something you don't get.
Apple's mapping solution should be superior to Google's on Android. Period. None of this "give them time to make it right" nonsense.
BTW, it's a myth that Google won't allow turn by turn on the iPhone.