WL is our absolute favorite place to stay. After all the visits we have made, I find it hard to see how anyone could say it was dirty, loud or horrible. If you are a light sleeper, there are areas that could be considered loud such as right off the lobby or over the service area, but as a whole, I believe WL to be a quiet place. As for dirty, there could have been a housekeeping issue for someone or their expectations too high. After all, it is still a hotel, just with a Disney name and theme.
I may have to go check trip advisor to see what was said. It is my experience that mostly bad reviews get posted on those sights. When we have great experience we tend not to go to a website and report them, but if we have a bad one, we want to tell everyone.