i have no complaints with iOS 6 whatsoever. in fact, it probably was the main reason for me staying with a Pure/Stock iPhone. i'm not saying it is a jailbreak replacement but i am saying it does what i need it to do now
the overall usability is great on the 4S and very smooth. unfortunately i think to have the best user experience one should restore as new. of course this argument will go on forever but i am speaking from my experience. i have always restored as new every major update and that the same time never experienced the plethora of threads/posts i constantly see
also keep in mind Apple will be doing delta updates along the way to improve it so its not like it will stay this way forever, if you're unhappy with it