Of course people have the right to play the game. Why would any review of any type with any content affect that?

I would be pretty upset if a review left out any aspect that significantly affected playability. And for me, and in my experience plenty of others, the level of despicable behavior in the game affects its playability. Not the fantasy violence, or the mature level, per se, but the moral issues. I would also be upset if the reviewer left out a discussion of the actual game play. It's not a review to say "It's wrong, don't buy it." But I also don't think it's a responsible review to say "I had fun, buy it," if it is reasonable to expect a significant number of people won't find it fun.