I have said this on another post, but since the question has arisen once more, I will repeat.
When I had my first contacts with the JWs in the mid-1960s, what they were saying did sound quite interesting. In fact, that was what probably drew me towards them back then - as by contrast, the "mainstream" churches seemed to be boring and quite irrelevant.
This seemed to also be the case into the 1970s and 80s; I had family members who agreed to the JW offer of a "Bible Study", simply because what the Witnesses were saying came over as very interesting. Feedback we used to get, too, from the "Territory" was that "these people are interesting."
Certainly, though, during the decades since then, all the fizz and the sparkle has long since gone out of it!