I might get blasted but I have to say that although I didn't make the best choices I dont feel the years were a waste.
1. Being a JW kept me off the streets that claimed the lives of classmates.
2. It gave me my wife
3. It gave me my children.
4. Say what you chose but the theocratic school made me unafraid to speak in front of people and I was/am far more skilled at public speaking them almost anyone I met. Which helped my career and allowed me to be very successful.
There were some negatives, but at some point you have to realize that had you never been a JW you could have just as easily been fucked up in a variety of other ways