OK. There's a huge difference between a review and something called defamation (I really hope that's the right term). If you take it to the personal level and accuse someone with no evidence, then you don't deserve to hide behind a "review immunity."
However, there's something else that worries me a lot, and no one seems to notice. Can you see that the "industry" is gonna take an advantage of this situation? They're gonna say, oh nice, let's scare off all people thinking about negative reviews.
My point is, if you think twice before posting a review, if you measure twice every single word you're gonna put in your review, then THEY have won. When I'm posting a review, I see it as a duty to contribute to the truth and wellbeing of other potential users and customers.
A product, service, company, or whatever, with no single negative review, or at least a criticizing one is a very, very suspicious to me. So, the next time someone asks for a help here, because of the potential lawsuit for an alleged defamation how about a helping hand and a little bit of support.
Just take this guy as a perfect example: