There have been several instances here in the U.S. of restaurants suing reviewers and/or their newspapers because of unfavourable reviews, and
the resultant loss of revenue, damaged reputation, etc.

And apparently some papers are becoming gun-shy (please excuse the mixed-metaphor) about publishing restaurant reviews.
The legal fees alone make them tend to settle out-of-court, so the restaurant gets a publicity boost equivalent to a good review when a settlement is reached.

Now this tactic could also extend to movies, plays, books, concerts, CDs, etc.
So musical Mudcatters, whattaya say?; next time one of us gets an unfavourable review, or even a lukewarm one, let's sue the shit out of the reviewer and the publication!