I find that a handful of people I know won't upgrade to iOS 6 due to vague and uninformed reasons. When I pressed on, I don't get any specifics. "I read about it, and I heard half my apps won't work, and other stuff".
Not that they're wrong, but it couldn't hurt to be more informed before dismissing it completely.
I dunno, it's fairly buggy in general. I've run into a few issues outside of maps including but not limited to:
1. The screen not reilluminating when I touch it after it dims from being idle. I'll have to use the lock button to turn the screen off and then turn it back on. This is the most frequent annoyance, and has happened at least a couple dozen times.
2. The App Store icon showing an update badge, but nothing being listed when I open it. I'll have to force close it and reopen it to get it to show up. Also happens frequently.
3. The phone rebooting itself when I switch to Safari, for no real reason at all. Only happened once so far, but I know it's happened to others as well, including you.
4. When I start up a song, it will stop playing in the background when I leave the music app. I'll have to reboot the phone to get it to work properly again. Has happened a couple of times.