As a born and raised third generation, I'd have to say it was doctrine that did it for me, though somewhat indirectly.
I always thought some of the doctrinal issues were silly, such as the plauges of Revelation being Assemblies in Cedar Point in the twenties that nobody cared about. However, I don't think this is at all unusual among faithful witnesses, including Elders, CO's and DO's. It's just never talked about.
However, that didn't bother me. Every belief system has some weirdness that you have to live with. What got me was gaining an understanding of some of the orginal intent and methodology of who and how the bible was written. That and realizing that it was just another mythology system. I just couldn't fake it anymore.
I always got along with most of the people.