I'm sure there are a host of nouns and adjectives to accomplish this feat. I harken 'Dilettante' or pejoratively 'rote teacher'.
a person who takes up an art, activity, or subject merely for amusement, especially in a desultory or superficial way; dabbler. "dilettante". Dictionary.com Unabridged. Random House, Inc. 25 Dec. 2016. http://www.dictionary.com/browse/dilettante>.
Mark Carlson is a Dilettante , he cannot teach a thing.
Mark Carlson is a rote teacher , he is ineffective at responding to the differing learning methods of his pupils.
perhaps specious -- apparently good or right though lacking real merit; superficially pleasing or plausible: "specious". Dictionary.com Unabridged. Random House, Inc. 25 Dec. 2016. http://www.dictionary.com/browse/specious>.
Mark Carlson is Specious , he cannot teach a thing
any of a class of professional teachers in ancient Greece who gave instruction in various fields, as in general culture, rhetoric, politics, or disputation.
a person belonging to this class at a later period who, while professing to teach skill in reasoning, concerned himself with ingenuity and specious effectiveness rather than soundness of argument. "sophists". Dictionary.com Unabridged. Random House, Inc. 25 Dec. 2016. http://www.dictionary.com/browse/sophists>.
Mark Carlson is a Sophist , he cannot teach a thing.