I would only consider it a failure to NOT address the issue of qualifications to teach on a subject as important as magic. I have been a High Priestess for some 20 years..as in with an actual, real-life coven in a Tradition that prides itself on the level of education and training required of its members. One of the major problems, IMHO, that I am seeing in the magical community and the Pagan community are people with little or no training, or who approach magic as though it was a role-playing game, setting themselves up as teachers. While this might be great for their egos and their self-esteem it does little for the gaining of accurate information and knowledge from those who they choose to teach.
The OP has set himself up as one who is a teacher...and therefore it would be assumed one who knows what they are talking about. I am pointing out that their posts here on this site suggest that the level of knowledge they claim to have on the subject is unsupported and that those looking for a genuine teacher need to consider whether such a person will give them the knowledge they wish to have.
The idea that we should never "judge" someone is simply ridiculous. We all make judgements all the time. Is that person someone I want around my kids? Is that person a true friend? Is that person possibly going to hurt me? Judgement keeps us from getting into situations that we don't want to be in.
Anyone who is seriously looking for a teacher of magic also needs to be making judgements. Does this person know what they are talking about? What is their background as far as experience and training? Are they mature enough to deal with conflicts that might arise? How many students have they actually taught? All of these are valid questions that should be asked before someone decides whether to accept another as a teacher...in other words makes a judgement.