...I find the vast majority of people know little to nothing about them despite their never-ending "preaching work".
And as a non-jw I'd suggest that a large reason is that it isn't "preaching", it's selling. JWs don't come to the door to tell you you may not have a blood transfusion and you must regard your family and close friends as "walking corpses", they tell you that Paradise will be here 'soon' and everything wrong with the world will be 'fixed'. A bible study will tell you how!
If the householder already knows some of the typically jw beliefs they sometimes offer a weak defense, but quickly move on.
The great majority of what people know about jws is from contacts like Talesin, and from sites like these.
Retro