Hard to not be a fan of QC. Without QC, it's all just a delusion. To some extent, you'd like to believe that in exchange for hosting their site, site managers should be required to adhere to some kind of quality assurance. Without that, it's up to the user to assess quality, and that assessment is done, as I have done, by just comparing values from adjacent stations. We've all seen the maps of stations, where one station is providing simply bizarre numbers. Often, they just ALWAYS provide bizarre numbers. You learn to just ignore those stations when, ideally, that station really needs to be chucked from the host.
Yes, WU exists, as a host. They do a pretty good job as a host, actually. But they pretty much have their eyes closed about what they're hosting.