I wonder if the player feedback system will actually do anything. In Reach and 3, there were options to submit Player Reviews but they did not affect your matches. You could avoid a whole team of players and still match them multiple times in a row, and (in one personal case in Reach) even months later. As far as I can tell Player Reviews only affect the ever-pointless Rep thing. I hope Player Reviews will actually count for something now.
(Feel free to correct me if I’m wrong about it not doing anything before - I only have personal experience to base that on.)