Halo 2's ranking system made it one of the best online multiplayer experiences of all time. With these past few halo title releases, all after Halo 2, I have yet to experience another. None have come close to the competitivity displayed in Halo 2. I'm looking forward to Halo 4, hoping that it just may remaster the ranking system embedded in Halo 2. I'm all for a ranking system, if not exact, just maybe somewhere mildly close to that of Halo 2's very own.
Oh! And also of course, the return of the BR and all of it's meritorious capabilities! (Off-topic I know, sorry, I couldn't help myself!) tehehe!!