Even when I realized it was not the one true religion, I was still in denial that it was a cult. I was still tied to the definition of cult as the WTS had us believe.
But the further away I got from it, the more I realized, and admitted to myself, it was indeed a cult. So I had no real 'initial reaction'...it was more of a slow realization and acceptance. Not that it didn't cause anger or frustration.
It's still frustrating in that using the word "cult" around the wrong people only makes matters worse. I use it on this board and that's about it. Outside of here, most people don't really know the meaning of cult as we have come to learn it. Even non-JWs are leary of the word cult when it comes to labeling JWs, Mormons and other off center religions.