I would try to determine what their attraction is, and go from there. I would share my life as a JW, the good, and then depending on what they say, I would share the bad:
Shunning- if at any point, should they question ANYTHING, they would be marked, shunned.
Ever evolving blood issue - you could lose your life if a decision was made on a vague doctrine, which could be reversed at any time. Many lives lost for a doctrine that has been now modified.
Education - If they are educated, they would be expected to not provide higher education for their family or they become marked, or counseled.