I got some very good lessons from being a JW, specifically from what they taught us. I was a born-in so sometimes the lessons I learned weren't what the converted would notice. But some of them very much apply to my life now and will for the rest of my life.
1.) I was not taught to be racist. I happened to spend most of my life in the Philadelphia area, which has a lot of immigrants. There was always a lot of diversity in my congregations which was also reflected in the publications. I'm not ignorant enough to think that there is never racism in the whole organization, only that I didn't experience it and I wasn't taught to be racist.
2.) I was taught to think about what I am doing and why I am doing it. I am a proud American and yet I have never pledged my allegiance to the flag and I never will. I took the time to think this through once I left the cult and realized that I think it is dumb to pledge my allegiance to any representation of my country because people can misuse a 'representation' of the country. This teaching didn't work in favor of the cult however, in fact it backfired. But it has been a very good lesson.
3.) I was taught to be strong enough that other's people's opinions neither sway me nor harm me. It sucked growing up being bullied for being different and always being on the outside because I couldn't do anything fun, or anything the other kids were doing. But as an adult I find that to be a really really good skill to have.