Just a couple of general comments:
1. The problem should have never happened but glad to hear it was addressed quickly and amicably.
2. 100% quality assurance is never,
ever, EVER going to happen. Walt Disney World employs nearly 70,000 people. Not every CM can be screened, cross-checked, supervised and otherwise managed such that their work is impeccable every single minute they are on the job.
3. In addition to the number of CMs, it's worth noting that there are something like 5000 - 7000
DVC check-ins every single week. One or two or ten or twenty bad reports in a week still equates to a level of quality and satisfaction that most businesses could only dream of achieving.
4. With all of the above said, folks who live and die with every third-person account posted to an Internet forum are needlessly adding to their own aggravation, IMO. No matter what DVC does. No matter how positive of an impact Clair Bilby has. No matter how many levels of room inspections and supervision are added, problems will slip through the cracks.
It's very unfortunate that this happened to OP and again I'm glad it was resolved quickly and with a nice credit offered. But this discussion is of no value when trying to evaluate Disney's success or failure in dealing with thousands of arriving guests per week. 10 threads like this tell us nothing. 100 threads like this tell us nothing. We just don't have the data to determine the extent of such problems occurring at the resorts.
Best thing any Disney guest can do--DVC member or not--is to approach their trip with high expectations and deal with any issues as they occur. Contact housekeeping. Walk to the front desk and speak with a manager. Disney still has high standards for its staff and will typically bend over backward to help resolve any issues if/when they occur.