This is a shame. I have used tripadvisor and other sites like it when making travel plans. Who in their right mind is going to post a negative review of a place knowing that they might get sued for it? Even if you win the suit, the time and money spent defending yourself make it not worth posting a review to help out a fellow traveller.
Post something like "I was considering posting a review, but will not do so until XXX posts a notice that they will not sue people who express their opinions".
Get a few reviews like that, and it would be worse than an open complaint about bugs.