I can't help but wonder if you were on the same trip my husband and I experienced -
While we might not be as negative as you, we are pretty strongly tilted in the same direction. At best we'd say that our Dubrovnik trip was a "barebones" version of what we've experienced in our other GC trips.
Yes, our hotel was changed in Opatija - not to a miserable one but definitely a lesser one. And yes, the optional tours were generally overpriced. And yes, the included lunches were, for the most part, not too good.
But --- we did not have any orientation walks in the neighborhood. We did not visit a school, although we traveled during the fall, when school was operating. We did not visit any of the GC Foundation sites. Perhaps there aren't any in Croatia/Slovenia, but the fact that GCT HAS a foundation was not mentioned. On a slightly lesser level, we didn't talk about anything controversial, even though this area has been through a major war and dislocation in the recent past.
We did have an exceptionally good home-hosted dinner. At least that was worthwhile.
If we do another trip, we'll be very cautious.
Thanks for your report - nice to know not everyone is overly awed by any given tour.