iOS 16 is perfectly fine with battery life. Everyone says updates destroy your battery life and this is correct because for a short period of time your battery life is going to suck. This is with iOS 16, 15, 14, 13 etc. etc..Update to iOS 16 obliterating battery life and performance because of security, they said. It will be fine, they said.
As to bugs well, it’s not ad stable as iOS 15. At least not for me.