I was having that problem before the upgrade.
Definitely wait. I too am having all kinds of problems with Wi-Fi including my kids. My wife has not yet upgraded to iOS 6 and she is happy!
I would wait.
Me too. Our 3 iphones have constantly dropped in and out of wifi for at least a year. My blackberry has no problems as well as the ipad and laptop. The first time one of my kids goes over the data plan, I will be having a discussion with ATT.
I have not upgraded to IOS6 on my Iphone 4S but have noticed in the last 4- 6 weeks the dropping of WiFi in my house. This is not an issue I had previously experienced. Also I have to manual connect to Wifi may times at the house.
Another interesting bug is that I have two WiFi networks at the house, and the Iphone has stopped connecting to one (the non Apple network).