We too are currently on Vista and I am interested in your observations as compared to ours, but this thread seems to have taken a left turn (as is typical of the Oceania board). Looking forward to reading more.
We have never encountered problem children on a Princess cruise. Nor have we encountered adults acting improperly but you never know when you might encounter someone aspiring to be that person.
You are absolutely correct, it just reinforces my thought that I would rather be seated next to a child than an obnoxious drunk relating false tales about his sexual conquests.