In AlanF's thread on whether or not Thirdson (or whoever!) is a GB apologist, there are several posts discussing the intelligence of JWs.
On that subject, this is what I observed from over 30 years as a JW:
There are some really bright Witnesses, but the average publisher in a congregation could not explain to you how the WTS came up with the year 1914, what the Society's blood policy is and the reasoning behind it , how the ransom sacrifice applies to the Great Crowd, or dozens of other "deeper" teachings of the WTS. In fact, I would be surprised if you could find 5 people in any congregation of 100 publishers who could accurately explain any of these teachings. I've written before how, when I went over the medical directives with publishers in the congregation, explaining to them what the Society's view was on blood fractions, an individuals choice of blood fraction usage would change instantly when I said that blood fractions were totally up to the individual. That was such an eye-opener to me. As another thread on here recently made clear, blood usage for the typical Witness has nothing to do with the Bible and everything to do with what the WTS says.
My former mother-in-law is a wonderful woman, and has brought over 100 people into the Witnesses - but she was pregnant at 16 and never completed high school. She was typical of many, many Witnesses I knew. My former father-in-law knew nothing about science, and he was the first to admit it. Yet, as an elder, he taught a number of Book Studys in the Life How Did It Get Here? book.
The point is made in AlanF's thread that the Witnesses, in general, lack critical thinking skills, and I would have to agree with that. When I was an elder, I remember comments made at the Watchtower study making fun of the Catholic Church because it traced it's history back to the Apostles. I reminded the congregation that the FDS does the same thing. Then there were the comments making fun of religions based on human sacrifice. Hell-o! I made the comment that Christianity is the main religion ever to be based on human sacrifice! Jesus Christ! And I mean that in both ways. When I made those comments, you'd see heads nodding like a lightbulb had just come on for some folks.
Intelligent people can find an outlet as a Witness, but it is only by studying and becoming an expert on what the WTS has written. If you truly use critical thinking skills, you will quickly become an ex-JW. That's why the Society disparages "critical thinking" and "skepticism" in its literature.
S4