The native iOS 6 Maps are just short of wretched. No transit directions, unhelpful default views, a dramatically weaker points of interest database, weaker scrolling performance, and a busier UI that doesn't add anything of great use. It's a rather big turd in an otherwise delicious punchbowl, and it is going to become a real-world talking point about iPhones starting today.
My fear is now Apple is becoming more bean counter and less passion, strong-opinion driven. To let Maps out in this shape is a troubling misstep.