Why can you not see what a quiz's ratings are?

I'm sorry, but what do you mean? Where are you looking? What rating are you taking about - how the players rate the quiz or the difficulty?

Yes i do mean how the players rate the quiz as in Very Poor, Poor, Average etc.

That ends up being factored into how well the quiz is rated throughout the site. You can see the orders by looking at a specific category - those rated better are at the top.

You can't view how each player rates your quiz, if that's what you're asking.