"Compared to nothing, most things look good."
I agree. While the WT did provide structure, and certain skills for me while growing up, there would have been many ways far more beneficial to acquire that training. For instance, I could have learned social qualities of teamwork by playing sports, learned speaking skills by being on the debate team, learned a clean-cut lifestyle by going to most any church, etc. Those things are not necessarily dependent on circumstances such as being raised within WT framework.
IF you are comparing it to NOTHING at all, then yes, I agree with your premise, being raised with WT values was likely better than nothing in those particular areas you mention. But it's a faulty argument, because think of all the other things you learned during your upbringing. You learned to memorize everything and research nothing. (Any research was done with an index and the WT volumes, where you would read the presented material. Full stop.) You learned to judge anyone, JW friend or "worldly" foe, if they stepped one millimeter out of lockstep with your "bible understanding/bible-trained conscience." You learned to get up and give a 4-5 minute speech, that you read off of a notecard, cobbled together from WT publications. (These are the most approved talks, TOO much "outside material" got you a talking-to after the meeting...) You were told not to blow your own horn when you did good, but learned that if none of the congregation heard about it you didn't get "credit." And that "credit," whether it was for more hours in service, talks, quickbuilds, bible studies, or informal witnessing, really determined your social standing.
You learned that, while it wasn't okay to be prejudiced against a person's color, it was perfectly okay to be prejudiced against the stay-at-home mom who wasn't pioneering even though she "had plenty of time," the publisher who STILL hadn't joined the TMS, the 19 y.o. kid who STILL hadn't gotten baptized, and all of the Catholics, Jews, Baptists, Methodists, SDA, LDS, other protestants, Buddhists, atheists... oh yes, and WOMEN, who are not permitted to challenge anything spoken by an overseer.
But yeah, compared to NO upbringing at all, I guess the WT training was better than nothing.