The DIS is just a tool.
And like any other tool, it works as well or as poorly as the person using it.
I use this tool for research, I have found some great excursions at better prices than
DCL offers. I have found some great idea's that have saved me money, time, and hassels. For the Aug repo cruise, wow, the hard work of several folks is saving me a substantial amount on everything from transfers to sovies to excursions.
In my trip reports one tends to find the good, the bad and the ugly. Our side trip to the Cozumel super market to get vanilla, was a life lesson for my kids, they saw how different the country could be three blocks inland. Would I have know about that store is not for the DIS, NO. Similarly I felt honor bound to those that went after me to report that our credit card number stayed in Mexico after we were gone because we made the mistake of using it at a shop not on the disney list.
Dining rotations, servers, room stewards are all the luck of the draw, we have been very happy sometimes, sometimes not, and that is all OK. We have never had a "bad" cruise, but we have had ones that were more fun than othrers. I can totally understand how someone would love to share their good fortune in getting an upgrade with a group that would understand. That does not mean I expect the same treatment. Life happens.
The best part of the DIS for me, is connecting with some folks I'll be traveling with. That is most important this time as it will be just my daughter and I for two weeks on a ship. In the past it was great to go to a show or movie and see someone there that you have gotten to know through the message board. I am still close to last years group, which met up the year before and had so much fun we did it again.
Anyone who has their expectations set in stone should read trip reports from last August, pick a week, any week. There were challenges and changes and a high degree of adapability required. This can and will happen again, those that have information are better prepared to deal with it.
Read it all ,take what you can use, and file the rest
And have the best cruise you can