I haven't seen anything on iOS 6 that I'd consider an upgrade so far.
The new Maps application is poor at absolute best. I tested three locations so far with turn by turn directions.
1. It says my house is an 1/8 of a mile away from where it really is in Great Falls, VA. The Google powered application pins my house right along the driveway which is useful.
2. It tells me to take the left exit for me to get to work. It is a right exit, and that left exit has been gone for over 15 years. It was actually never an exit, it was a turn.
3. In a large shopping center, it told me my destination was on the complete opposite side of where it was truly located.
Other than the Maps issues, I have found the battery life to be atrociously poor. The worst thing of all though, is the lag that I have been experiencing when going through menus and then through some of the Apple apps (not 3rd party). People laugh at Android, but this is really bad.
Also, the new Music app looks like it is an alpha build. It looks completely unfinished and unpolished. I appreciate the larger "buttons" but the overall look and feel of the app is awful.
[EDIT] Don't even get me started on the new App Store layout either.
Overall, this seems like it has been a very poor upgrade, if you can call it an upgrade at all. After less than 24 hours of use, I have seen nothing impressive.
/rant
Sorry, had to get that out of my system.
Anybody noticed a lag in scrolling on Safari...?