Did you notice that you can now rate a game with stars from 1 to 5 stars.
You can see it when you're playing a game and then enter the System menu (double tap the OUYA button).
It's on the right side where the game suggestions are usually.
I'm not near the console to take a picture but wanted to see what you guys think of that?

I noticed that the score descriptions are worded in a way that encourages more middle scores of 3 stars e.g. 3 stars means Pretty fun, 4 stars Love it! and 5 stars Wow. Amazing or something like that. Only 1 and 2 star scores have "bad" descriptions.