I thought this was an interesting way to look at amateur instructors...
"Many spiritual seekers are not yet ready to become the disciples of spiritual mentors. Their present levels of commitment may suit working only with Buddhism professors, Dharma instructors, or meditation or ritual trainers. Even if they are ready to commit themselves to the Buddhist path and to spiritual mentors, they may not yet have found properly qualified mentors. Alternatively, the spiritual teachers available to them may be properly qualified and may even have shown them great kindness. Yet, none seem right to be their mentors. They feel they can relate to them only as their Buddhism professors. Nevertheless, the Kadam style of guru-meditation may still help such seekers to gain inspiration from these teachers at the present stages of their spiritual paths.
Unless our spiritual teachers are total charlatans or complete scoundrels, all of them have at least some good qualities and exhibit at least some level of kindness. Our Buddhism professors, Dharma instructors, or meditation or ritual trainers may lack the qualities of great spiritual mentors. Still, they have some knowledge of the Dharma, some insight from applying the Dharma to life, or some technical expertise in the practice. Our teachers are kind to instruct us, even if their motivations contain the wish to earn a living. If we correctly discern and acknowledge whatever qualities and levels of kindness that our professors, instructors, or trainers in fact possess, we may derive inspiration, through guru-meditation, by focusing on them with conviction and appreciation."
--from Wise Teacher, Wise Student: Tibetan Approaches to a Healthy Relationship by Dr. Alexander Berzin, published by Snow Lion Publications