Mild notoriety only within Wikipedia?  Within Wikipedia, it has been the single most discussed web site for the past 6 months straight, far surpassing the likes of Wikitruth, which has its own article.  Outside of Wikipedia, it has an Alexa ranking currently of 35,000, which also far exceeds Wikitruth's of 100,000 or so.  It has been in an increasing number of news reports as well, up around 20 from reputable sources now, and the frequency of these is increasing as well.  

It is known for things outside of Wikipedia too:

1) As an example of censorship - Wikipedia has gone to pains to censor it.  This is relevant to people who have no idea what Wikipedia is, because this is a critic site that is not allowed to exist.
2) Cyber stalking, hate speech, and many other issues which Wikipedia Review has hit on, and it has been viewed by some pro-Wikipedia loyalists that Wikipedia Review is an example of these, and that it should be discussed in a context that does not include discussion of Wikipedia, or of its criticisms of Wikipedia.

It is the first and largest place for criticism of Wikipedia.  In such circumstances, notability is clearly established.

It is not just a forum, it has its own domain name too and exists as a legal entity.

The original article was created as spam just days after the forum was created.  At that time, it should have been deleted.  We are looking at a vastly different picture now.