Survey results of iOS 6 Maps users in the USA
It's a small, self selected survey as far as I can tell. So take it for what that's worth.
"To answer this question I created a survey in Google Consumer Surveys tool that ran from Friday October 5th through Sunday October 7th. The recent survey indicates that over half of current users of the new app were not affected at all by the app and over 91% fell in the "not going to jump off the Empire State Building" cohort. 74% were satisfied or perhaps just didn't notice. Only 3.2% indicated that the Map App would definitely prevent them from buying another iPhone in the future."
The author includes plots and discussion of results. Maybe the numbers will be different if it was an international survey.