It is always wrong - always. I was beaten as a kid and grew to hate my Dad. When he died I felt nothing except sadness for my mother. For me the beatings stopped. I have never smacked my kids and even when I felt like it I stepped back. My neighbor on the other hand spanked her kids so much it had no effect. They knew how to be violent towards my kids as it was all they knew.Spanking was always the first resort - never the last.
My kids are mannerly, quiet and well behaved and yet again the latest school report complimented them on their behavior. I was recently taken aside by the year tutor who knew all of my kids who told me they were such nice kids - I felt so good! I am widowed with four kids(when my youngest was just four) so you can imagine it would have been easy to resort to spanking when things got too much for me. I never did and I am so glad. I am firm and strict. I used words not violence and I can tell you my kids know never to get on the wrong side of me. Maybe that comes from being a teacher! lol
Strangely enough I have used many methods similar to Supernanny. (I developed them myself) When I look at the families she works with and the way she resolves situations with WORDS and appropriate actions I am positive I have made the correct choice.
Good luck to you with your choices and your child rearing.
Maggs