Good point over at Goodfil.ms in response to today’s XKCD comic:
Average ratings are, in their essence, an attempt to distil the entire set of ratings about an object (in our case, films), down to a single number. Which seems useful - after all, it saves you so much time deciding whether something’s any good. The problem is that that’s all it’s good for - telling you whether something’s good or not.
Their movie rating system, which uses two axes, stars and “rewatchability,” may be more useful than the alternatives out there.