Having been raised as a Jehovahs witness and leaving the faith in my early 20s, I think I have a good comparison to make.
In fact; I have an EXCELLENT comparison to make.
The ONLY thing remotely positive of which I could credit that relgion with is possibly self discipline. I learned that at an early age. As a child; I learned to be "different" from the other kids I went to school with. I did not belong; and learned to do things on my own; not swayed by peer pressure. I chose to make this a positive issue in my life; others have not dealt so positively with this. It is a hard life for a child to have to be different from their peers.
The good values system in my life I learned from my parents. The Biblical knowledge I was " pumped" with as a child; was all relearned in college classes of ancient history; with a very different slant and secular meaning. The "public speaking" was also learned in college; albeit that I had a head start due to my "ministry school" training. Easiest "A " I ever got in school. If I use my plublic speaking skills now with a client or addressing an audience for a presentation; it is due to my self confidence as a person and professional; not my "trust in Jehovah"
As for the shunning ( of which the JWs are so proud); I learned that there are real "friends" in the world; that there are good and decent people such as myself "in the world"; all living the same life and striving to make sense of the 75 plus years we all share this planet together ; on a journey to who knows where or why. There are all the same loves and losses and happiness and pain; why make life any harder than it has to be? Why inflict pain on your fellow man; for no other reason than that he has a different perspective than you?
I have learned the hard way that the Jehovahs Witnesses and their teachings are not any different than the Nazis of fascist WW2 Germany.
Anything Positive? NO.