Of the homeschooled kids I know , who are now adults, all of the ones ( non JW ) I personally know graduated with honors, attended college, ( two attended a demanding prestigious high school ). have fantastic professions. Each one has been highly educated, intelligent, well adjusted. The parents took home schooling as it is supposed to be. It's not about isolation. it's about giving them MORE than the hours in a classroom desk with ditto sheets could provide. It's about socializing the children more effectively than one teacher with 30 kids, Two eyes can not properly watch, and take time to correct every child. More adults with the children and there is more supervision, more chances for teaching moments in socializing. They were able to participate in many more social classes, like sports, and the arts. These parents saw the opportunity, advantage and value in homeschooling.
However, I know of two adults who were home schooled JWs. Those two adults both have a horrible work ethic, the mom basically left them to educate themselves. handed them the class books then did her own thing many days. ( out preaching or working at her job ) She saw no real value in the education, so that translated to her kids). Granted, a non JW parent could also screw up homeschooling, and likely do. But my own experience where many in my community home school. It is the JW Kids/adults who are both now 30+ and still struggle. The girl still lives at home, the other married a couple years ago and his spouse is the breadwinner! He went to a trade school eventually in his later 20's but could never " find a job". HVAC repair, how can you mess THAT up (unless you refuse to work the required hours, or just never learned how to study the material and really learn)?
So on my soapbox, I want to be clear. Homeschooling IMO, done by parents who value education, IS superior to a traditional classroom 5 days a week.