I'm a born in, born in the 1980s and old enough to remember studying beefy (albeit full of crap) material like the the evolution book and Revelation book (which we studied over and over and over and over). Books and brochures were wordy and chock full of legalistic language explaining away teachings and policies, some explanations slightly above the IQ of the average person.
Watchtower studies were longer (30 paragraphs sometimes), talks were longer and thus meetings were longer, pioneering was harder (70 hours if I remember correctly), assemblies and conventions were longer, and there were intricate food provisions to feed thousands of people (for a cost of course).
The average JW could recite Watchtower propaganda for hours to indoctrinate others or defend their faith. JWs were interested in having meaty discussions at the door and challenging even pastors on doctrinal points.
I know this has been said many times, but the organization has gone through a massive DUMBING DOWN.
I can't figure out if it's due to the oblivious nature of the current Governing Body, a premeditated attempt by them at dumbing down the organization, or just the effects of life becoming easier around the globe due to reliance on technology.
I can only speak on my era, and I know that from the early 90s until around 2004 the organization was allot more doctrine savy.
Over the past decade or so I'd say the collective IQ of the followers has moved from 105 to 85.
Indoctrination and blind belief has allot to do with being prone to be emotionally manipulated, but thinking ability has a say in that too.
Social media is a decent gauge of how and what the average person within a certain demographic is thinking, and doing a simple hashtag search on Twitter, Instagram, or Facebook reveals allot about how the current generation of young JWs (15-28 or thereabout) are thinking.
Many have become self obsessed, internet obsessed, hubris filled and passive, I can see an even bigger decline in growth over the next 5 years.
Take a look:
http://instagram.com/jehovahswitnesses1914 (I hope this is really an apostate, nobody in their right mind could be oblivious to all this borderline 'apostate' material.
Instagram - search hashtag #governingbody (the governing body is literally now worshipped by them)
Instagram - search hashtag #jwboys (JW males showing off themselves online)
Instagram - search hashtag #jwgirls (JW females showing off themselves online)
Instagram - search hashtag #jwwedding (no need for explanation)
Instagram - search hashtag #jwcomedy