Apple have never an will never allow a downgrade of iOS, so it's not a step backwards.
iOS 4 turned the 3G into a brick but they eventually found a workaround with updates.
iOS 6 has made my 4S faster and slicker.
You can get google maps via their website and copy to homepage
Find a friend is much better
I think I have sorted out passbook now, sorry cant remember the link you need to follow.
I you think you may have an issue with an iOS, don't update on day 1, wait for 6.0.1 which is bound to be a couple if weeks away.
Even typing this on my phone is slicker than before!
If you have an issue with your iPhone 5, remember that there are always issues with new phones and learn to wait a couple of weeks before getting one
Well done apple - a good iOS version!