They NEED to bring back the halo 2 ranking system,
-(level 1-10) Win 2 games LEVEL up (lose 2 rank down)
-(level 11-20) Win 3 games LEVEL up (lose 3 rank down)
-(level 21-30) Win 4 games LEVEL up (lose 4 rank down)
-(level 31-40) Win 5 games LEVEL up (lose 5 rank down)
-(level 41-50) Win 6 games LEVEL up (lose 6 rank down)
Here's a hypothetical situation
Say you rank to level 25, you are here (24 - - - - I - - - - 26)
Say you win a game on your 25 now you are here (24 - - - - - I - - - 26)
Now Say you lose 2 games in a row.... (24 - - - I - - - - - 26)
So I hope you understand, that level 25 will have to win 5 games to become 26, or that 25 will have to loose 3 games to become a 24.
That level 25 could go on 343.com (or whatever the website is) and they can check how close they are to their next rank (with a progress bar)
LIKE IN HALO 2