Why aren't the reasons for moderating reviews explained clearly?

I wrote a review about a movie I considered good. Nothing pornographic, nothing ultra violent, it's an historical movie very well made. And yet my review is stuck for "moderation". I would like IMDb to post a clear list of reasons why reviews are moderated, that should be honest and not just include the obvious ones, like use of profanities. This is not the first time that one of my reviews is not published, and often this is done for controversial movies or TV series that got very low ratings, but in this case the movie is good and I wouldn't lower the ratings or advice the audience to stay away.