While venting on discussion forums may make one feel good, it doesn't accomplish anything. If you don't contact Disney to complain, how will they know if you are outraged? If they got little to no complaints from the public, they certainly won't see the need to improve their testing process, will they?
How is DVC Member Services going to address a problem which occurred in another division of Disney? DVC has nothing to do with the online ADR system. Complaints about the DVC member web site should be directed to DVC Member Satisfaction, but complaints about the online ADR system should be addressed to WDW Guest Communications.