Right, but what if the module with 75 ratings is eight years old, is well known, and published in three different books, and the other module with five ratings is only a year old but happens to be a vast improvment over the older one?

I agree that you shouldn't repeat what's already been said, but I've seen modules with, say, seven rantings/reviews where not one reviewer ever bothered to say why it was so good, just that it was, and that doesn't help me that much when I need to compare it with something else.