In the beginning of waking up, I denied it was a cult or that JWs were under mind control. That is because I did not understand what a cult or mind control was. This is in part that I relied on the Watchtower definition of why they were not a cult, and because movies and TV rarely portray this phenomena in a realistic manner. Educating myself on the subject opened my eyes further.
The best definition of a cult is a high control group—this group might be religious, commercial, or political. Mind control is undue influence. There are four barometers of control: Behavioral, Information, Thought, and Emotion. In a mainstream religion or in a non-religious group, these four barometers register on the low end of the scale, whereas in the Watchtower religion, all four of these barometers are on the high end.
Until a person educates themselves on cults and undue influence, they cannot really offer effective arguments on why a said group is or is not a cult. I recommend Steven Hassan, Robert Lifton, or Leon Festinger.