You could argue that folding the Vertigo books in to the DCU was a PR disaster but, uh, that was almost three years ago. The whole Vertigo snafu was roughly three years ago. From a business perspective, it made a decent amount of sense. Xanadu was never that great a seller and Hellblazer's sales were flagging; and while Vertigo had started out as an imprint using DC characters to tell stories "too mature" for the main line, that hasn't been the case in quite some time. By the time of the reboot, the majority of Vertigo's output was creator owned books, and had been that way for years. The end result was that Constantine and Xanadu (and maybe Swamp Thing? Was that still being published at the time?) were cancelled. It's not like they folded the majority of Vertigo to put characters back in the DCU. And we got Swamp Thing and Animal Man, which don't seem to have suffered from being put under the DC banner. The quality suffered some from the crossover but there doesn't seem to be any attempt on DC's end to censor mature content, and both books seem to be headed back in the right direction now. As for Constantine, it's not that bad. People rag on it for not being Hellblazer, but Hellblazer was around for a long time and while it had its high moments, there was a good deal of mediocrity too.
And then there's Dial H, which honestly may as well have been a Vertigo book. It's been left to basically do its own thing without interference from the rest of the DC line and it was personally edited by Karen Berger, who would have been doing it under the old Vertigo. There aren't any rumors going around that China has suffered from the authoritarian editorial mandates some other books have. If I were to guess, I'd say it's a good book but not a great book, and that probably has more to do with Mieville not having any comic book experience than with what imprint it was written under.
DC has made plenty of mistakes with the reboot, but this just sounds like fanboys looking for an excuse to be outraged.
Edit: They are totally on the money about the "52 book" mandate though. Churning out half-cooked books just to meet some magical number is a tremendously silly way for them to handle their publishing. As is books that are getting cancelled 6-8 issues in, with the announcement happening barely after the first issue has hit shelves. If you're confident enough to give a book the greenlight, you should at least be confident enough to let it run at least a year. It's just a sloppy and haphazard publishing model.
It's almost as ridiculous as having a whole web page dedicated to how furious you are with a company that produces superhero comics.