It's funny but now that I've had more time with the maps it's pretty impressive how much better it is as a basic GPS compared to say Navigon or Motion-X. It's much simpler but very effective. I've also seen improvements to the map detail already.
I don't think that the Apple maps is the ideal ADV gps but the iPhone 5 is certainly a big improvement. I'd love for someone to make an Adv style GPS that could find dirt roads - I've been asking for that for years.