Metallica Kills Early Reviews of Upcoming Album

The band seemed to have learned somewhat from the dark days of the Napster debacle by offering fans online access to pre-release material and in-studio video footage, but now it has apparently unleashed another potentially damaging fiasco upon itself by forcing bloggers to take down reviews of their upcoming album.
Metallica representatives played the album for The Quietus contributor "Bob Mulhouse" in London last Wednesday, after he did what one would expect: he posted a review on his blog.
Metallica held a listening party for music reviewers and was surprised when some of them wrote reviews? That has to be a public relations first.
It's still unclear why Metallica's management didn't require the reviewers to sign non-disclosure agreements if they didn't want them to write about it.