Nick Farrell wrote signs that you might not be a real magician. You can find a beautiful counter response at Post Modern Magic. In reading these I am reminded of my response to the glass half full question. In my opinion, most folks just have the wrong sized glass.
A successful theurgist is not worried about who is doing it wrong and who is doing it right. We are concerned with doing it.
"There is a place between right thinking and wrong thinking; I will meet you there." -- Gilbran.