The roster is completely broken, not only does it not show parties of your friends, but it never shows all of you friends t once, only some at any given moment.
I really want the roster to work because Halo 4’s UI sucked (trading card game style) and I miss Reach’s system. The system in MCC would be awesome if it worked because the xbo one UI for friends/invites is terribly slow and not user-friendly. The roster would be a perfect alternative but its still completely broken.