It was hard for me to think of Jehovah's Witnesses as cultists when I left. I just couldn't see it. At best, I would say, it was a high-control group. I always thought of a cult as a group that separated themselves from society to the point of having their own compound, dressing all alike in weird clothes, and having one single leader that they follow as their savior who is supposedly the voice of God.
Now, the longer that I am gone, the more I realize how much of a cult that the organization really is. They may not stick out like a sore thumb like many smaller cults, but they are a cult none the less. They do separate themselves from society and view everyone else as inherently evil and dangerous. And in a way, they even have their own compounds for the specially priveledged governing body and the other "fortunate" ones who get to go live there to be a slave servant for "Jehovah".
They also make up their own rules and claim the direction comes from God. And while they may no longer have one single leader that they follow, their have evolved their cult leadership into a group of like-minded old men. They still serve the same purpose and they still claim to be the sole voice of God.
The most convincing reason that they are cult is because it is so damned hard to leave. No, they do not threaten to kidnap you or lock you up until you come to your senses, as is sensationalized as happening in some cults, but they have you so brainwashed that you believe it will be your utter destruction if you do. They use emotional blackmail to try to coerse you to stay, and then encourage your family to disown you if you do not. They do everything they can to silence their dissenters.
Some people disagree that JW's brainwash. I believe they do. They brainwash you no matter if you were brought up from infancy, or even if you joined as an adult. I just think it is more tragic and engrained if it is done from infancy. But even if you do not believe they brainwash, they have just about every other hallmark of a cult group.