Austrian Economics Wiki:Reviewspace
The Review: namespace is for book reviews, essay reviews, etc. Like mainspace articles, reviews are considered to represent the views of Mises Wiki.
Alternative venues
Reviews can also be posted in essayspace (e.g. Essay:Review of Human Action), if the desire is to post an opinion that does not necessarily represent the views of Mises Wiki. If the user desires to maintain editorial control over his review, then he can post it to userspace. Mainspace can also be a place where flaws in books, essays, etc. are pointed out.
talk pages of the book or essay in question provide another venue for criticism, as long as there is intent through comments posted there to result in changes being made to the page associated with that talk page. E.g., if someone notes that he disagrees with Mises' comments in Human Action on democracy, the criticisms might eventually make their way into the democracy, Human Action, or criticism of Human Action articles. Even if the criticisms are not valid, those might be suitable venues for debunking the criticisms.