Here is just a snippet of one of Leonard's answers:
Finally, yes, lots of people scan theatre reviews—all kinds of reviews,
in fact—so as to make their lives easy, for someone else to tell them what is and isn’t worth their cash. That’s why some papers and websites use star-rating systems and all kinds of aesthetic hieroglyphics. I don’t know a single critic who likes it. It reinforces laziness in the reader and puts critics in the one place they’re least suitable to be—in charge of the family budget.