Originally Posted by Rob

As long as you don't make shit up then I don't see how they could have grounds to sue you. Movie companies don't sue critics for giving bad reviews. Consumer Reports has been around for ages and I'm pretty sure they haven't been sued.

You are entitled to your opinion and I'm sure that if you share it or allow others to share their opinion then there is no fear of being sued. I think it's a good idea and go for it.