I for one like iOS6. I use a 4s and it installed and has no issues so far.
battery seems a touch better(good before)
It seems a touch snappier(good before)
I love the Maps App. In my area its been awesome. Its evry accurate, more accurate than Google Maps, Bing Map, my new 30day old Garmin.
Its integration is awesome
I like how I dont need to set my screen to NEVER turn off just to keep map open like in Google Maps
I like with screen off, you still get turn by turn and when the turn is approaching, the screen powers up in lock screen displaying map briefly until you turn then powers off again.
I like the banner it displays in the top giving directions if you've left the app to do other things.
IMO, iOS6 offers some nice new touches.
Panorama is GREAT!
New Siri has been even better(i liked before)
I dont know why so many are having issues, but myself and 2 others(one iPad3 and one iPhone 4) have liked it. No issues.
I guess it depends on area you live for Maps, but I suppose you can always go back if you dont like.