Fraudulent is as fraudulent does.

Theodore Dalrymple an essayist who is called by some; the greatest living social commentator and who is a man of extensive worldly experience as both a psychiatrist and a doctor, who has made an impact as a writer for many years, and is in most senses of the word a 'refined' man of taste, says about art critics that they are frauds who write about frauds for frauds to read.

I am sure that there are exceptions to that 'rule' but in my experience he has hit the nail on the head.