JW prospects are most definitely not properly informed about the JW religion and organization before becoming baptized. And most JWs really do know this.
Many years ago I was intensively researching the history of JWs, and I brought up a number of negative findings to my JW parents. My mom always tried to wiggle away from the problems, to the point that I got frustrated and said to her over the phone, "Mom, if one of your Bible students asked the same questions I'm asking, what would you do?" "Well, I'd try to convince them to put off their questions so that they could see the big picture and get baptized," she said. I said, "Ok, and what about answering the questions you had them put off?" She said, "Well, I'd hope that by then they'd have enough sense not to ask them!" I said, "Mom, do you realize what you just told me?" "No," sez she. I said, "You just told me that you'd lie to your Bible students to get them to become JWs." She said, "Oh! OH! I can't handle this!" and she handed the phone to my stepdad.
At the heart of almost every JW lies a core of deception, because most of them have come across many serious challenges to their religion that they've just buried away, telling themselves that there's no problem here. During the conversion process they've done a good deal of burying of facts and problems, and so their acceptance of the cult boils down a purely emotional decision.
The typical JW will deny and deny that things work this way, but when they're seriously challenged with facts, they either deny the facts, or run away in terror.