I'm not so sure. I've been around for a while, and the tone on ENWorld has always felt more anti- than pro-WotC.
I could be wrong; I haven't read
every thread, but I've read thousands of them and I noticed that if Wizards of the Coast gets mentioned in a thread at all, it's usually in the form of a complaint. Seems like even if they do the right thing, someone will chime in about how they are doing it for the wrong reasons, or in response to other even more terrible stuff they got caught doing, or etc.
As
@J.Quondam points out, this is just Internet culture in a nutshell. It's not meant to be a sweeping criticism of ENWorld in general. Hate-posting always generates more interest (and therefore, more traffic) than the rest.